diff options
| author | Minchan Kim <[email protected]> | 2022-03-22 14:39:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2022-03-22 15:57:01 -0700 |
| commit | c0226eb8bde854e016a594a16f5c0d98aca426fa (patch) | |
| tree | 47171e4a456ae9bf87f3c1036181527e85d68751 /tools/perf/scripts/python/event_analyzing_sample.py | |
| parent | 854d8e36168d79ad09a831d60bd4d835ad33e188 (diff) | |
mm: fs: fix lru_cache_disabled race in bh_lru
Check lru_cache_disabled under bh_lru_lock. Otherwise, it could introduce
race below and it fails to migrate pages containing buffer_head.
CPU 0 CPU 1
bh_lru_install
lru_cache_disable
lru_cache_disabled = false
atomic_inc(&lru_disable_count);
invalidate_bh_lrus_cpu of CPU 0
bh_lru_lock
__invalidate_bh_lrus
bh_lru_unlock
bh_lru_lock
install the bh
bh_lru_unlock
WHen this race happens a CMA allocation fails, which is critical for
the workload which depends on CMA.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 8cc621d2f45d ("mm: fs: invalidate BH LRU during page migration")
Signed-off-by: Minchan Kim <[email protected]>
Cc: Chris Goldsworthy <[email protected]>
Cc: Marcelo Tosatti <[email protected]>
Cc: John Dias <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/event_analyzing_sample.py')
0 files changed, 0 insertions, 0 deletions