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| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2022-12-05 22:03:27 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-12-11 18:12:21 -0800 |
| commit | de2e5171433126d340573cb7d0d4fcac084ab2a0 (patch) | |
| tree | 853a2c011413ff9a83d08bf53b6a8a3198a16387 /mm/madvise.c | |
| parent | 8614d6c5eda005ad72b37afeaae2879d7c101b18 (diff) | |
| download | linux-rpi-de2e5171433126d340573cb7d0d4fcac084ab2a0.tar.gz linux-rpi-de2e5171433126d340573cb7d0d4fcac084ab2a0.tar.bz2 linux-rpi-de2e5171433126d340573cb7d0d4fcac084ab2a0.zip | |
mm: add cond_resched() in swapin_walk_pmd_entry()
When handling MADV_WILLNEED in madvise(), a soflockup may occurr in
swapin_walk_pmd_entry() if swapping in lots of memory on a slow device.
Add a cond_resched() to avoid the possible softlockup.
Link: https://lkml.kernel.org/r/20221205140327.72304-1-wangkefeng.wang@huawei.com
Fixes: 1998cc048901 ("mm: make madvise(MADV_WILLNEED) support swap file prefetch")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Shaohua Li <shli@fusionio.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
| -rw-r--r-- | mm/madvise.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index 2573ea3ed684..b7d9b1a1c135 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -223,6 +223,7 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start, put_page(page); } swap_read_unplug(splug); + cond_resched(); return 0; } |