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After 10 retries, we will give up and the remaining pages will be counted
as failure in nr_failed and nr_thp_failed. We should count the failure in
nr_failed_pages too. This is done in this patch.
Link: https://lkml.kernel.org/r/20220817081408.513338-8-ying.huang@intel.com
Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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If THP is failed to be migrated, it may be split and retry. But after
splitting, the head page will be left in "from" list, although THP
migration failure has been counted already. If the head page is failed to
be migrated too, the failure will be counted twice incorrectly. So this
is fixed in this patch via moving the head page of THP after splitting to
"thp_split_pages" too.
Link: https://lkml.kernel.org/r/20220817081408.513338-7-ying.huang@intel.com
Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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If THP or hugetlbfs page migration isn't supported, unmap_and_move() or
unmap_and_move_huge_page() will return -ENOSYS. For THP, splitting will
be tried, but if splitting doesn't succeed, the THP will be left in "from"
list wrongly. If some other pages are retried, the THP migration failure
will counted again. This is fixed via moving the failure THP from "from"
to "ret_pages".
Another issue of the original code is that the unsupported failure
processing isn't consistent between THP and hugetlbfs page. Make them
consistent in this patch to make the code easier to be understood too.
Link: https://lkml.kernel.org/r/20220817081408.513338-6-ying.huang@intel.com
Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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If THP is failed to be migrated for -ENOSYS and -ENOMEM, the THP will be
split into thp_split_pages, and after other pages are migrated, pages in
thp_split_pages will be migrated with no_subpage_counting == true, because
its failure have been counted already. If some pages in thp_split_pages
are retried during migration, we should not count their failure if
no_subpage_counting == true too. This is done this patch to fix the
failure counting for THP subpages retrying.
Link: https://lkml.kernel.org/r/20220817081408.513338-5-ying.huang@intel.com
Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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In unmap_and_move(), if the new THP cannot be allocated, -ENOMEM will be
returned, and migrate_pages() will try to split the THP unless "reason" is
MR_NUMA_MISPLACED (that is, nosplit == true). But when nosplit == true,
the THP migration failure will not be counted.
This is incorrect, so in this patch, the THP migration failure will be
counted for -ENOMEM regardless of nosplit is true or false. The nr_failed
counting isn't fixed because it's not used. Added some comments for it
per Baolin's suggestion.
Link: https://lkml.kernel.org/r/20220817081408.513338-4-ying.huang@intel.com
Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Before commit b5bade978e9b ("mm: migrate: fix the return value of
migrate_pages()"), the tail pages of THP will be put in the "from"
list directly. So one of the loop cursors (page2) needs to be reset,
as is done in try_split_thp() via list_safe_reset_next(). But after
the commit, the tail pages of THP will be put in a dedicated
list (thp_split_pages). That is, the "from" list will not be changed
during splitting. So, it's unnecessary to call list_safe_reset_next()
anymore.
This is a code cleanup, no functionality changes are expected.
Link: https://lkml.kernel.org/r/20220817081408.513338-3-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Patch series "migrate_pages(): fix several bugs in error path", v3.
During review the code of migrate_pages() and build a test program for
it. Several bugs in error path are identified and fixed in this
series.
Most patches are tested via
- Apply error-inject.patch in Linux kernel
- Compile test-migrate.c (with -lnuma)
- Test with test-migrate.sh
error-inject.patch, test-migrate.c, and test-migrate.sh are as below.
It turns out that error injection is an important tool to fix bugs in
error path.
This patch (of 8):
The return value of move_pages() syscall is incorrect when counting
the remaining pages to be migrated. For example, for the following
test program,
"
#define _GNU_SOURCE
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include <numaif.h>
#include <numa.h>
#ifndef MADV_FREE
#define MADV_FREE 8 /* free pages only if memory pressure */
#endif
#define ONE_MB (1024 * 1024)
#define MAP_SIZE (16 * ONE_MB)
#define THP_SIZE (2 * ONE_MB)
#define THP_MASK (THP_SIZE - 1)
#define ERR_EXIT_ON(cond, msg) \
do { \
int __cond_in_macro = (cond); \
if (__cond_in_macro) \
error_exit(__cond_in_macro, (msg)); \
} while (0)
void error_msg(int ret, int nr, int *status, const char *msg)
{
int i;
fprintf(stderr, "Error: %s, ret : %d, error: %s\n",
msg, ret, strerror(errno));
if (!nr)
return;
fprintf(stderr, "status: ");
for (i = 0; i < nr; i++)
fprintf(stderr, "%d ", status[i]);
fprintf(stderr, "\n");
}
void error_exit(int ret, const char *msg)
{
error_msg(ret, 0, NULL, msg);
exit(1);
}
int page_size;
bool do_vmsplice;
bool do_thp;
static int pipe_fds[2];
void *addr;
char *pn;
char *pn1;
void *pages[2];
int status[2];
void prepare()
{
int ret;
struct iovec iov;
if (addr) {
munmap(addr, MAP_SIZE);
close(pipe_fds[0]);
close(pipe_fds[1]);
}
ret = pipe(pipe_fds);
ERR_EXIT_ON(ret, "pipe");
addr = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ERR_EXIT_ON(addr == MAP_FAILED, "mmap");
if (do_thp) {
ret = madvise(addr, MAP_SIZE, MADV_HUGEPAGE);
ERR_EXIT_ON(ret, "advise hugepage");
}
pn = (char *)(((unsigned long)addr + THP_SIZE) & ~THP_MASK);
pn1 = pn + THP_SIZE;
pages[0] = pn;
pages[1] = pn1;
*pn = 1;
if (do_vmsplice) {
iov.iov_base = pn;
iov.iov_len = page_size;
ret = vmsplice(pipe_fds[1], &iov, 1, 0);
ERR_EXIT_ON(ret < 0, "vmsplice");
}
status[0] = status[1] = 1024;
}
void test_migrate()
{
int ret;
int nodes[2] = { 1, 1 };
pid_t pid = getpid();
prepare();
ret = move_pages(pid, 1, pages, nodes, status, MPOL_MF_MOVE_ALL);
error_msg(ret, 1, status, "move 1 page");
prepare();
ret = move_pages(pid, 2, pages, nodes, status, MPOL_MF_MOVE_ALL);
error_msg(ret, 2, status, "move 2 pages, page 1 not mapped");
prepare();
*pn1 = 1;
ret = move_pages(pid, 2, pages, nodes, status, MPOL_MF_MOVE_ALL);
error_msg(ret, 2, status, "move 2 pages");
prepare();
*pn1 = 1;
nodes[1] = 0;
ret = move_pages(pid, 2, pages, nodes, status, MPOL_MF_MOVE_ALL);
error_msg(ret, 2, status, "move 2 pages, page 1 to node 0");
}
int main(int argc, char *argv[])
{
numa_run_on_node(0);
page_size = getpagesize();
test_migrate();
fprintf(stderr, "\nMake page 0 cannot be migrated:\n");
do_vmsplice = true;
test_migrate();
fprintf(stderr, "\nTest THP:\n");
do_thp = true;
do_vmsplice = false;
test_migrate();
fprintf(stderr, "\nTHP: make page 0 cannot be migrated:\n");
do_vmsplice = true;
test_migrate();
return 0;
}
"
The output of the current kernel is,
"
Error: move 1 page, ret : 0, error: Success
status: 1
Error: move 2 pages, page 1 not mapped, ret : 0, error: Success
status: 1 -14
Error: move 2 pages, ret : 0, error: Success
status: 1 1
Error: move 2 pages, page 1 to node 0, ret : 0, error: Success
status: 1 0
Make page 0 cannot be migrated:
Error: move 1 page, ret : 0, error: Success
status: 1024
Error: move 2 pages, page 1 not mapped, ret : 1, error: Success
status: 1024 -14
Error: move 2 pages, ret : 0, error: Success
status: 1024 1024
Error: move 2 pages, page 1 to node 0, ret : 1, error: Success
status: 1024 1024
"
While the expected output is,
"
Error: move 1 page, ret : 0, error: Success
status: 1
Error: move 2 pages, page 1 not mapped, ret : 0, error: Success
status: 1 -14
Error: move 2 pages, ret : 0, error: Success
status: 1 1
Error: move 2 pages, page 1 to node 0, ret : 0, error: Success
status: 1 0
Make page 0 cannot be migrated:
Error: move 1 page, ret : 1, error: Success
status: 1024
Error: move 2 pages, page 1 not mapped, ret : 1, error: Success
status: 1024 -14
Error: move 2 pages, ret : 1, error: Success
status: 1024 1024
Error: move 2 pages, page 1 to node 0, ret : 2, error: Success
status: 1024 1024
"
Fix this via correcting the remaining pages counting. With the fix,
the output for the test program as above is expected.
Link: https://lkml.kernel.org/r/20220817081408.513338-1-ying.huang@intel.com
Link: https://lkml.kernel.org/r/20220817081408.513338-2-ying.huang@intel.com
Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Once upon a time, we only support accounting thrashing of page cache.
Then Joonsoo introduced workingset detection for anonymous pages and we
gained the ability to account thrashing of them[1].
So let delayacct account both the thrashing of page cache and anonymous
pages, this could make the codes more consistent and simpler.
[1] commit aae466b0052e ("mm/swap: implement workingset detection for anonymous LRU")
Link: https://lkml.kernel.org/r/20220805033838.1714674-1-yang.yang29@zte.com.cn
Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@gmail.com>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Introduce a variable swap_migration_ad_supported to cache whether the arch
supports swap migration A/D bits.
Here one thing to mention is that SWP_MIG_TOTAL_BITS will internally
reference the other macro MAX_PHYSMEM_BITS, which is a function call on
x86 (constant on all the rest of archs).
It's safe to reference it in swapfile_init() because when reaching here
we're already during initcalls level 4 so we must have initialized 5-level
pgtable for x86_64 (right after early_identify_cpu() finishes).
- start_kernel
- setup_arch
- early_cpu_init
- get_cpu_cap --> fetch from CPUID (including X86_FEATURE_LA57)
- early_identify_cpu --> clear X86_FEATURE_LA57 (if early lvl5 not enabled (USE_EARLY_PGTABLE_L5))
- arch_call_rest_init
- rest_init
- kernel_init
- kernel_init_freeable
- do_basic_setup
- do_initcalls --> calls swapfile_init() (initcall level 4)
This should slightly speed up the migration swap entry handlings.
Link: https://lkml.kernel.org/r/20220811161331.37055-8-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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We used to have swapfile_maximum_size() fetching a maximum value of
swapfile size per-arch.
As the caller of max_swapfile_size() grows, this patch introduce a
variable "swapfile_maximum_size" and cache the value of old
max_swapfile_size(), so that we don't need to calculate the value every
time.
Caching the value in swapfile_init() is safe because when reaching the
phase we should have initialized all the relevant information. Here the
major arch to take care of is x86, which defines the max swapfile size
based on L1TF mitigation.
Here both X86_BUG_L1TF or l1tf_mitigation should have been setup properly
when reaching swapfile_init(). As a reference, the code path looks like
this for x86:
- start_kernel
- setup_arch
- early_cpu_init
- early_identify_cpu --> setup X86_BUG_L1TF
- parse_early_param
- l1tf_cmdline --> set l1tf_mitigation
- check_bugs
- l1tf_select_mitigation --> set l1tf_mitigation
- arch_call_rest_init
- rest_init
- kernel_init
- kernel_init_freeable
- do_basic_setup
- do_initcalls --> calls swapfile_init() (initcall level 4)
The swapfile size only depends on swp pte format on non-x86 archs, so
caching it is safe too.
Since at it, rename max_swapfile_size() to arch_max_swapfile_size()
because arch can define its own function, so it's more straightforward to
have "arch_" as its prefix. At the meantime, export swapfile_maximum_size
to replace the old usages of max_swapfile_size().
[peterx@redhat.com: declare arch_max_swapfile_size) in swapfile.h]
Link: https://lkml.kernel.org/r/YxTh1GuC6ro5fKL5@xz-m1.local
Link: https://lkml.kernel.org/r/20220811161331.37055-7-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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When page migration happens, we always ignore the young/dirty bit settings
in the old pgtable, and marking the page as old in the new page table
using either pte_mkold() or pmd_mkold(), and keeping the pte clean.
That's fine from functional-wise, but that's not friendly to page reclaim
because the moving page can be actively accessed within the procedure.
Not to mention hardware setting the young bit can bring quite some
overhead on some systems, e.g. x86_64 needs a few hundreds nanoseconds to
set the bit. The same slowdown problem to dirty bits when the memory is
first written after page migration happened.
Actually we can easily remember the A/D bit configuration and recover the
information after the page is migrated. To achieve it, define a new set
of bits in the migration swap offset field to cache the A/D bits for old
pte. Then when removing/recovering the migration entry, we can recover
the A/D bits even if the page changed.
One thing to mention is that here we used max_swapfile_size() to detect
how many swp offset bits we have, and we'll only enable this feature if we
know the swp offset is big enough to store both the PFN value and the A/D
bits. Otherwise the A/D bits are dropped like before.
Link: https://lkml.kernel.org/r/20220811161331.37055-6-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Carry over the dirty bit from pmd to pte when a huge pmd splits. It
shouldn't be a correctness issue since when pmd_dirty() we'll have the
page marked dirty anyway, however having dirty bit carried over helps the
next initial writes of split ptes on some archs like x86.
Link: https://lkml.kernel.org/r/20220811161331.37055-5-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Huang Ying <ying.huang@intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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We've got a bunch of special swap entries that stores PFN inside the swap
offset fields. To fetch the PFN, normally the user just calls
swp_offset() assuming that'll be the PFN.
Add a helper swp_offset_pfn() to fetch the PFN instead, fetching only the
max possible length of a PFN on the host, meanwhile doing proper check
with MAX_PHYSMEM_BITS to make sure the swap offsets can actually store the
PFNs properly always using the BUILD_BUG_ON() in is_pfn_swap_entry().
One reason to do so is we never tried to sanitize whether swap offset can
really fit for storing PFN. At the meantime, this patch also prepares us
with the future possibility to store more information inside the swp
offset field, so assuming "swp_offset(entry)" to be the PFN will not stand
any more very soon.
Replace many of the swp_offset() callers to use swp_offset_pfn() where
proper. Note that many of the existing users are not candidates for the
replacement, e.g.:
(1) When the swap entry is not a pfn swap entry at all, or,
(2) when we wanna keep the whole swp_offset but only change the swp type.
For the latter, it can happen when fork() triggered on a write-migration
swap entry pte, we may want to only change the migration type from
write->read but keep the rest, so it's not "fetching PFN" but "changing
swap type only". They're left aside so that when there're more
information within the swp offset they'll be carried over naturally in
those cases.
Since at it, dropping hwpoison_entry_to_pfn() because that's exactly what
the new swp_offset_pfn() is about.
Link: https://lkml.kernel.org/r/20220811161331.37055-4-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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swapops.h contains quite a few layers of ifdef, some of the "else" and
"endif" doesn't get proper comment on the macro so it's hard to follow on
what are they referring to. Add the comments.
Link: https://lkml.kernel.org/r/20220811161331.37055-3-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Suggested-by: Nadav Amit <nadav.amit@gmail.com>
Reviewed-by: Huang Ying <ying.huang@intel.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Patch series "mm: Remember a/d bits for migration entries", v4.
Problem
=======
When migrating a page, right now we always mark the migrated page as old &
clean.
However that could lead to at least two problems:
(1) We lost the real hot/cold information while we could have persisted.
That information shouldn't change even if the backing page is changed
after the migration,
(2) There can be always extra overhead on the immediate next access to
any migrated page, because hardware MMU needs cycles to set the young
bit again for reads, and dirty bits for write, as long as the
hardware MMU supports these bits.
Many of the recent upstream works showed that (2) is not something trivial
and actually very measurable. In my test case, reading 1G chunk of memory
- jumping in page size intervals - could take 99ms just because of the
extra setting on the young bit on a generic x86_64 system, comparing to
4ms if young set.
This issue is originally reported by Andrea Arcangeli.
Solution
========
To solve this problem, this patchset tries to remember the young/dirty
bits in the migration entries and carry them over when recovering the
ptes.
We have the chance to do so because in many systems the swap offset is not
really fully used. Migration entries use swp offset to store PFN only,
while the PFN is normally not as large as swp offset and normally smaller.
It means we do have some free bits in swp offset that we can use to store
things like A/D bits, and that's how this series tried to approach this
problem.
max_swapfile_size() is used here to detect per-arch offset length in swp
entries. We'll automatically remember the A/D bits when we find that we
have enough swp offset field to keep both the PFN and the extra bits.
Since max_swapfile_size() can be slow, the last two patches cache the
results for it and also swap_migration_ad_supported as a whole.
Known Issues / TODOs
====================
We still haven't taught madvise() to recognize the new A/D bits in
migration entries, namely MADV_COLD/MADV_FREE. E.g. when MADV_COLD upon
a migration entry. It's not clear yet on whether we should clear the A
bit, or we should just drop the entry directly.
We didn't teach idle page tracking on the new migration entries, because
it'll need larger rework on the tree on rmap pgtable walk. However it
should make it already better because before this patchset page will be
old page after migration, so the series will fix potential false negative
of idle page tracking when pages were migrated before observing.
The other thing is migration A/D bits will not start to working for
private device swap entries. The code is there for completeness but since
private device swap entries do not yet have fields to store A/D bits, even
if we'll persistent A/D across present pte switching to migration entry,
we'll lose it again when the migration entry converted to private device
swap entry.
Tests
=====
After the patchset applied, the immediate read access test [1] of above 1G
chunk after migration can shrink from 99ms to 4ms. The test is done by
moving 1G pages from node 0->1->0 then read it in page size jumps. The
test is with Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz.
Similar effect can also be measured when writting the memory the 1st time
after migration.
After applying the patchset, both initial immediate read/write after page
migrated will perform similarly like before migration happened.
Patch Layout
============
Patch 1-2: Cleanups from either previous versions or on swapops.h macros.
Patch 3-4: Prepare for the introduction of migration A/D bits
Patch 5: The core patch to remember young/dirty bit in swap offsets.
Patch 6-7: Cache relevant fields to make migration_entry_supports_ad() fast.
[1] https://github.com/xzpeter/clibs/blob/master/misc/swap-young.c
This patch (of 7):
Replace all the magic "5" with the macro.
Link: https://lkml.kernel.org/r/20220811161331.37055-1-peterx@redhat.com
Link: https://lkml.kernel.org/r/20220811161331.37055-2-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
1.Remove meaningless comment in kill_proc(). That doesn't tell anything.
2.Fix the wrong function name get_hwpoison_unless_zero(). It should be
get_page_unless_zero().
3.The gate keeper for free hwpoison page has moved to check_new_page().
Update the corresponding comment.
Link: https://lkml.kernel.org/r/20220830123604.25763-7-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
PageTable can't be handled by memory_failure(). Filter it out explicitly in
hwpoison_user_mappings(). This will also make code more consistent with the
relevant check in unpoison_memory().
Link: https://lkml.kernel.org/r/20220830123604.25763-6-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
If vma->vm_mm != t->mm, there's no need to call page_mapped_in_vma() as
add_to_kill() won't be called in this case. Move up the mm check to avoid
possible unneeded calling to page_mapped_in_vma().
Link: https://lkml.kernel.org/r/20220830123604.25763-5-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Use num_poisoned_pages_sub() to combine multiple atomic ops into one. Also
num_poisoned_pages_dec() can be killed as there's no caller now.
Link: https://lkml.kernel.org/r/20220830123604.25763-4-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
It's more recommended to use __PageMovable() to detect non-lru movable
pages. We can avoid bumping page refcnt via isolate_movable_page() for
the isolated lru pages. Also if pages become PageLRU just after they're
checked but before trying to isolate them, isolate_lru_page() will be
called to do the right work.
[linmiaohe@huawei.com: fixes per Naoya Horiguchi]
Link: https://lkml.kernel.org/r/1f7ee86e-7d28-0d8c-e0de-b7a5a94519e8@huawei.com
Link: https://lkml.kernel.org/r/20220830123604.25763-3-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Patch series "A few cleanup patches for memory-failure".
his series contains a few cleanup patches to use __PageMovable() to detect
non-lru movable pages, use num_poisoned_pages_sub() to reduce multiple
atomic ops overheads and so on. More details can be found in the
respective changelogs.
This patch (of 6):
Use ClearPageHWPoison() instead of TestClearPageHWPoison() to clear page
hwpoison flags to avoid unneeded full memory barrier overhead.
Link: https://lkml.kernel.org/r/20220830123604.25763-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220830123604.25763-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
The syzbot reported the below problem:
BUG: Bad page map in process syz-executor198 pte:8000000071c00227 pmd:74b30067
addr:0000000020563000 vm_flags:08100077 anon_vma:ffff8880547d2200 mapping:0000000000000000 index:20563
file:(null) fault:0x0 mmap:0x0 read_folio:0x0
CPU: 1 PID: 3614 Comm: syz-executor198 Not tainted 6.0.0-rc3-next-20220901-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_bad_pte.cold+0x2a7/0x2d0 mm/memory.c:565
vm_normal_page+0x10c/0x2a0 mm/memory.c:636
hpage_collapse_scan_pmd+0x729/0x1da0 mm/khugepaged.c:1199
madvise_collapse+0x481/0x910 mm/khugepaged.c:2433
madvise_vma_behavior+0xd0a/0x1cc0 mm/madvise.c:1062
madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1236
do_madvise.part.0+0x24a/0x340 mm/madvise.c:1415
do_madvise mm/madvise.c:1428 [inline]
__do_sys_madvise mm/madvise.c:1428 [inline]
__se_sys_madvise mm/madvise.c:1426 [inline]
__x64_sys_madvise+0x113/0x150 mm/madvise.c:1426
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f770ba87929
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f770ba18308 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f770bb0f3f8 RCX: 00007f770ba87929
RDX: 0000000000000019 RSI: 0000000000600003 RDI: 0000000020000000
RBP: 00007f770bb0f3f0 R08: 00007f770ba18700 R09: 0000000000000000
R10: 00007f770ba18700 R11: 0000000000000246 R12: 00007f770bb0f3fc
R13: 00007ffc2d8b62ef R14: 00007f770ba18400 R15: 0000000000022000
Basically the test program does the below conceptually:
1. mmap 0x2000000 - 0x21000000 as anonymous region
2. mmap io_uring SQ stuff at 0x20563000 with MAP_FIXED, io_uring_mmap()
actually remaps the pages with special PTEs
3. call MADV_COLLAPSE for 0x20000000 - 0x21000000
It actually triggered the below race:
CPU A CPU B
mmap 0x20000000 - 0x21000000 as anon
madvise_collapse is called on this area
Retrieve start and end address from the vma (NEVER updated later!)
Collapsed the first 2M area and dropped mmap_lock
Acquire mmap_lock
mmap io_uring file at 0x20563000
Release mmap_lock
Reacquire mmap_lock
revalidate vma pass since 0x20200000 + 0x200000 > 0x20563000
scan the next 2M (0x20200000 - 0x20400000), but due to whatever reason it didn't release mmap_lock
scan the 3rd 2M area (start from 0x20400000)
get into the vma created by io_uring
The hend should be updated after MADV_COLLAPSE reacquire mmap_lock since
the vma may be shrunk. We don't have to worry about shink from the other
direction since it could be caught by hugepage_vma_revalidate(). Either
no valid vma is found or the vma doesn't fit anymore.
Link: https://lkml.kernel.org/r/20220914162220.787703-1-shy828301@gmail.com
Fixes: 7d8faaf155454f8 ("mm/madvise: introduce MADV_COLLAPSE sync hugepage collapse")
Reported-by: syzbot+915f3e317adb0e85835f@syzkaller.appspotmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Change the qcom_cc_probe_by_index() call to qcom_cc_really_probe()
to avoid remapping of memory region for index 0, which is already
being done through qcom_cc_map().
Fixes: 7c6a6641c2 ("clk: qcom: lpass: Add support for resets & external mclk for SC7280")
Signed-off-by: Satya Priya <quic_c_skakit@quicinc.com>
Reviewed-by: Neil Armstrong <neil.armstrong@baylibre.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/1663673683-7018-1-git-send-email-quic_c_skakit@quicinc.com
|
|
Add support for IPQ8074 since it uses the same PLL setup, however it uses
slightly different Alpha PLL config.
Alpha PLL config was obtained by dumping PLL registers from a running
device.
Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-7-robimarko@gmail.com
|
|
Update the IPQ6018 Alpha PLL config to the latest one from the downstream
5.4 kernel[1].
This one should match the production SoC-s.
Tested on IPQ6018 CP01-C1 reference board.
[1] https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.1.r4/drivers/clk/qcom/apss-ipq-pll.c#L41
Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-6-robimarko@gmail.com
|
|
Convert the driver to use OF match data for providing the Alpha PLL config
per compatible.
This is required for IPQ8074 support since it uses a different Alpha PLL
config.
While we are here rename "ipq_pll_config" to "ipq6018_pll_config" to make
it clear that it is for IPQ6018 only.
Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-5-robimarko@gmail.com
|
|
Add IPQ8074 compatible to A53 PLL bindings.
Signed-off-by: Robert Marko <robimarko@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-4-robimarko@gmail.com
|
|
While fixing up the driver I noticed that my IPQ8074 board was hanging
after CPUFreq switched the frequency during boot, WDT would eventually
reset it.
So mark apcs_alias0_core_clk as critical since its the clock feeding the
CPU cluster and must never be disabled.
Fixes: 5e77b4ef1b19 ("clk: qcom: Add ipq6018 apss clock controller")
Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-3-robimarko@gmail.com
|
|
While working on IPQ8074 APSS driver it was discovered that IPQ6018 and
IPQ8074 use almost the same PLL and APSS clocks, however APSS driver is
currently broken.
More precisely apcs_alias0_clk_src is broken, it was added as regmap_mux
clock.
However after debugging why it was always stuck at 800Mhz, it was figured
out that its not regmap_mux compatible at all.
It is a simple mux but it uses RCG2 register layout and control bits, so
utilize the new clk_rcg2_mux_closest_ops to correctly drive it while not
having to provide a dummy frequency table.
While we are here, use ARRAY_SIZE for number of parents.
Tested on IPQ6018-CP01-C1 reference board and multiple IPQ8074 boards.
Fixes: 5e77b4ef1b19 ("clk: qcom: Add ipq6018 apss clock controller")
Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-2-robimarko@gmail.com
|
|
An RCG may act as a mux that switch between 2 parents.
This is the case on IPQ6018 and IPQ8074 where the APCS core clk that feeds
the CPU cluster clock just switches between XO and the PLL that feeds it.
Add the required ops to add support for this special configuration and use
the generic mux function to determine the rate.
This way we dont have to keep a essentially dummy frequency table to use
RCG2 as a mux.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-1-robimarko@gmail.com
|
|
Prepare for storing the blkcg information in the gendisk instead of
the request_queue.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-18-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blkcg_schedule_throttle as part of moving the
blk-cgroup infrastructure to be gendisk based. Remove the unused
!BLK_CGROUP stub while we're at it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-17-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blkg_destroy_all as part of moving the blk-cgroup
infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-16-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blk_throtl_cancel_bios as part of moving the
blk-cgroup infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-15-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blk_throtl_register_queue as part of moving the
blk-cgroup infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blk_throtl_init and blk_throtl_exit as part of moving
the blk-cgroup infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-13-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Use a local disk variable instead of retrieving the disk and
request_queue over and over by various means.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-12-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blk_iocost_init as part of moving the blk-cgroup
infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Just directly dereference the disk name instead of going through multiple
hoops to find the same value.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blk_iolatency_init as part of moving the blk-cgroup
infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-9-hch@lst.de
[axboe: missed inline for blk_iolatency_init() and !CONFIG_BLK_CGROUP_IOLATENCY]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blk_ioprio_init and blk_ioprio_exit as part of moving
the blk-cgroup infrastructure to be gendisk based.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Pass the gendisk to blkcg_init_disk and blkcg_exit_disk as part of moving
the blk-cgroup infrastructure to be gendisk based. Also remove the
rather pointless kerneldoc comments for these internal functions with a
single caller each.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
The combinations of an error check with an ERR_PTR return and a lookup
with a NULL return leads to ugly handling of the return values in the
callers. Just open coding the check and the lookup is much simpler.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Add a fully inlined blkg_lookup as the extra two checks aren't going
to generated a lot more code vs the call to the slowpath routine, and
open code the hint update in the two callers that care.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Use blkg_lookup instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Just open code it in the only caller and drop the unused !BLK_CGROUP
stub.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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When blk_throtl_init fails, we need to call blk_ioprio_exit. Switch to
proper goto based unwinding to fix this.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220921180501.1539876-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Sean Anderson says:
====================
net: sunhme: Cleanups and logging improvements
This series is a continuation of [1] with a focus on logging improvements (in
the style of commit b11e5f6a3a5c ("net: sunhme: output link status with a single
print.")). I have included several of Rolf's patches in the series where
appropriate (with slight modifications). After this series is applied, many more
messages from this driver will come with driver/device information.
Additionally, most messages (especially debug messages) have been condensed onto
one line (as KERN_CONT messages get split).
[1] https://lore.kernel.org/netdev/4686583.GXAFRqVoOG@eto.sf-tec.de/
====================
Link: https://lore.kernel.org/r/20220924015339.1816744-1-seanga2@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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I have the hardware so at the very least I can test things.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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The SXD, TXD, and RXD macros are used only once (or twice). Just use the
vdbg print, which seems to have been devised for these sorts of very
verbose messages.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Huang Ying
Yang Yang
Peter Xu
Miaohe Lin
Yang Shi
Satya Priya
Robert Marko
Christian Marangi
Christoph Hellwig
Jakub Kicinski
Sean Anderson