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dm writecache: set a default MAX_WRITEBACK_JOBS

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commit ca7dc242e358e46d963b32f9d9dd829785a9e957 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka 2022-07-13 07:09:04 -04:00 committed by Greg Kroah-Hartman
parent 05cef0999b
commit 2c7e93e338
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-writecache.c
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@ -20,7 +20,7 @@
#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