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authorJan Kara <jack@suse.cz>2021-11-25 16:36:36 +0300
committerJens Axboe <axboe@kernel.dk>2021-11-29 16:38:51 +0300
commit44dfa279f117646163db0c8760addb45dd6a0e8c (patch)
tree3496a0836124e90628538818ae315efce4025bac /block/bfq-iosched.c
parent98f044999ba141a6b6b79cb3a996a73f05a46820 (diff)
downloadlinux-44dfa279f117646163db0c8760addb45dd6a0e8c.tar.xz
bfq: Store full bitmap depth in bfq_data
Store bitmap depth shift inside bfq_data so that we can use it in bfq_limit_depth() for proportioning when limiting number of available request tags for a cgroup. Acked-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20211125133645.27483-3-jack@suse.cz Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bfq-iosched.c')
-rw-r--r--block/bfq-iosched.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 1d564499614e..cf9247301e3c 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -6857,7 +6857,9 @@ static unsigned int bfq_update_depths(struct bfq_data *bfqd,
struct sbitmap_queue *bt)
{
unsigned int i, j, min_shallow = UINT_MAX;
+ unsigned int depth = 1U << bt->sb.shift;
+ bfqd->full_depth_shift = bt->sb.shift;
/*
* In-word depths if no bfq_queue is being weight-raised:
* leaving 25% of tags only for sync reads.
@@ -6869,13 +6871,13 @@ static unsigned int bfq_update_depths(struct bfq_data *bfqd,
* limit 'something'.
*/
/* no more than 50% of tags for async I/O */
- bfqd->word_depths[0][0] = max((1U << bt->sb.shift) >> 1, 1U);
+ bfqd->word_depths[0][0] = max(depth >> 1, 1U);
/*
* no more than 75% of tags for sync writes (25% extra tags
* w.r.t. async I/O, to prevent async I/O from starving sync
* writes)
*/
- bfqd->word_depths[0][1] = max(((1U << bt->sb.shift) * 3) >> 2, 1U);
+ bfqd->word_depths[0][1] = max((depth * 3) >> 2, 1U);
/*
* In-word depths in case some bfq_queue is being weight-
@@ -6885,9 +6887,9 @@ static unsigned int bfq_update_depths(struct bfq_data *bfqd,
* shortage.
*/
/* no more than ~18% of tags for async I/O */
- bfqd->word_depths[1][0] = max(((1U << bt->sb.shift) * 3) >> 4, 1U);
+ bfqd->word_depths[1][0] = max((depth * 3) >> 4, 1U);
/* no more than ~37% of tags for sync writes (~20% extra tags) */
- bfqd->word_depths[1][1] = max(((1U << bt->sb.shift) * 6) >> 4, 1U);
+ bfqd->word_depths[1][1] = max((depth * 6) >> 4, 1U);
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)