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| author |   Alexey Dobriyan <adobriyan@gmail.com> | 2018-04-10 16:31:52 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-11 10:28:34 -0700 |
| commit | b4884f23331ae31e9ecb617956986c3b76ab9a91 (patch) | |
| tree | 2f25f7337f1aedbfed4fa18b1b26ffa208136544 /fs/proc/root.c | |
| parent | proc: test /proc/self/syscall (diff) | |
| download | linux-dev-b4884f23331ae31e9ecb617956986c3b76ab9a91.tar.xz linux-dev-b4884f23331ae31e9ecb617956986c3b76ab9a91.zip | |
proc: move "struct proc_dir_entry" into kmem cache
"struct proc_dir_entry" is variable sized because of 0-length trailing
array for name, however, because of SLAB padding allocations it is
possible to make "struct proc_dir_entry" fixed sized and allocate same
amount of memory.
It buys fine-grained debugging with poisoning and usercopy protection
which is not possible with kmalloc-* caches.
Currently, on 32-bit 91+ byte allocations go into kmalloc-128 and on
64-bit 147+ byte allocations go to kmalloc-192 anyway.
Additional memory is allocated only for 38/46+ byte long names which are
rare or may not even exist in the wild.
Link: http://lkml.kernel.org/r/20180223205504.GA17139@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | fs/proc/root.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c index 98797b762a71..cd45abfbb6cc 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -208,7 +208,8 @@ struct proc_dir_entry proc_root = { .proc_fops = &proc_root_operations, .parent = &proc_root, .subdir = RB_ROOT_CACHED, - .name = "/proc", + .name = proc_root.inline_name, + .inline_name = "/proc", }; int pid_ns_prepare_proc(struct pid_namespace *ns) |