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bcache: add idle_max_writeback_rate sysfs interface

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For writeback mode, if there is no regular I/O request for a while,
the writeback rate will be set to the maximum value (1TB/s for now).
This is good for most of the storage workload, but there are still
people don't what the maximum writeback rate in I/O idle time.

This patch adds a sysfs interface file idle_max_writeback_rate to
permit people to disable maximum writeback rate. Then the minimum
writeback rate can be advised by writeback_rate_minimum in the
bcache device's sysfs interface.

Reported-by: Christian Balzer <chibi@gol.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li
2019-11-13 16:03:23 +08:00
committed by Jens Axboe
parent 5dccefd3ea
commit c5fcdedcee
4 changed files with 13 additions and 0 deletions
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4
drivers/md/bcache/writeback.c
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@@ -122,6 +122,10 @@ static void __update_writeback_rate(struct cached_dev *dc)
static bool set_at_max_writeback_rate(struct cache_set *c,
struct cached_dev *dc)
{
/* Don't sst max writeback rate if it is disabled */
if (!c->idle_max_writeback_rate_enabled)
return false;
/* Don't set max writeback rate if gc is running */
if (!c->gc_mark_valid)
return false;