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| author | Mikulas Patocka <mpatocka@redhat.com> | 2022-07-13 13:09:04 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@kernel.org> | 2022-07-14 21:52:31 +0200 |
| commit | ca7dc242e358e46d963b32f9d9dd829785a9e957 (patch) | |
| tree | e1af77a46c8c316dacefbcc2b9a713edd76de52c /drivers/md/dm-writecache.c | |
| parent | Documentation: dm writecache: Render status list as list (diff) | |
| download | linux-ca7dc242e358e46d963b32f9d9dd829785a9e957.tar.xz linux-ca7dc242e358e46d963b32f9d9dd829785a9e957.zip | |
dm writecache: set a default MAX_WRITEBACK_JOBS
dm-writecache has the capability to limit the number of writeback jobs
in progress. However, this feature was off by default. As such there
were some out-of-memory crashes observed when lowering the low
watermark while the cache is full.
This commit enables writeback limit by default. It is set to 256MiB or
1/16 of total system memory, whichever is smaller.
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Diffstat (limited to 'drivers/md/dm-writecache.c')
| -rw-r--r-- | drivers/md/dm-writecache.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index d74c5a7a0ab4..d572135cd43f 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -22,7 +22,7 @@ #define HIGH_WATERMARK 50 #define LOW_WATERMARK 45 -#define MAX_WRITEBACK_JOBS 0 +#define MAX_WRITEBACK_JOBS min(0x10000000 / PAGE_SIZE, totalram_pages() / 16) #define ENDIO_LATENCY 16 #define WRITEBACK_LATENCY 64 #define AUTOCOMMIT_BLOCKS_SSD 65536 |