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| author |   Matthew Wilcox <willy@infradead.org> | 2017-11-22 08:36:00 -0500 |
|---|---|---|
| committer | Matthew Wilcox <willy@infradead.org> | 2018-10-21 10:46:39 -0400 |
| commit | e21a29552fa3f44ea41c53488875015ae70fd7f8 (patch) | |
| tree | 615c10e662faa49f3910fb269d4be6d029513632 /mm | |
| parent | shmem: Convert shmem_confirm_swap to XArray (diff) | |
| download | linux-dev-e21a29552fa3f44ea41c53488875015ae70fd7f8.tar.xz linux-dev-e21a29552fa3f44ea41c53488875015ae70fd7f8.zip | |
shmem: Convert find_swap_entry to XArray
This is a 1:1 conversion. The major part of this patch is converting
the test framework from userspace to kernel space and mirroring the
algorithm now used in find_swap_entry().
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/shmem.c | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index ce91569426f3..a305529d6b89 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1100,34 +1100,27 @@ static void shmem_evict_inode(struct inode *inode) clear_inode(inode); } -static unsigned long find_swap_entry(struct radix_tree_root *root, void *item) +static unsigned long find_swap_entry(struct xarray *xa, void *item) { - struct radix_tree_iter iter; - void __rcu **slot; - unsigned long found = -1; + XA_STATE(xas, xa, 0); unsigned int checked = 0; + void *entry; rcu_read_lock(); - radix_tree_for_each_slot(slot, root, &iter, 0) { - void *entry = radix_tree_deref_slot(slot); - - if (radix_tree_deref_retry(entry)) { - slot = radix_tree_iter_retry(&iter); + xas_for_each(&xas, entry, ULONG_MAX) { + if (xas_retry(&xas, entry)) continue; - } - if (entry == item) { - found = iter.index; + if (entry == item) break; - } checked++; - if ((checked % 4096) != 0) + if ((checked % XA_CHECK_SCHED) != 0) continue; - slot = radix_tree_iter_resume(slot, &iter); + xas_pause(&xas); cond_resched_rcu(); } - rcu_read_unlock(); - return found; + + return entry ? xas.xa_index : -1; } /* |