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| author | Baolin Wang <baolin.wang@linux.alibaba.com> | 2020-09-07 16:10:15 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-09-14 19:36:54 -0600 |
| commit | e675df2adc2f0b8cbc0c64111d55b69f7253cbed (patch) | |
| tree | e10a57b5c114f92c90ff32e0ab67a3bae3accd15 /block/blk-throttle.c | |
| parent | ff8b22c0f258c936460b436f6d78ed49a3b2a4cf (diff) | |
| download | lwn-e675df2adc2f0b8cbc0c64111d55b69f7253cbed.tar.gz lwn-e675df2adc2f0b8cbc0c64111d55b69f7253cbed.zip | |
blk-throttle: Define readable macros instead of static variables
The 'throtl_grp_quantum' and 'throtl_quantum' are both read-only
variables, thus better to use readable macros instead of static
variables, which can also save some spaces for .bss area.
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 06e73ed3e774..ca9002d9d2c7 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -15,10 +15,10 @@ #include "blk-cgroup-rwstat.h" /* Max dispatch from a group in 1 round */ -static int throtl_grp_quantum = 8; +#define THROTL_GRP_QUANTUM 8 /* Total max dispatch from all groups in one round */ -static int throtl_quantum = 32; +#define THROTL_QUANTUM 32 /* Throttling is performed over a slice and after that slice is renewed */ #define DFL_THROTL_SLICE_HD (HZ / 10) @@ -1175,8 +1175,8 @@ static int throtl_dispatch_tg(struct throtl_grp *tg) { struct throtl_service_queue *sq = &tg->service_queue; unsigned int nr_reads = 0, nr_writes = 0; - unsigned int max_nr_reads = throtl_grp_quantum*3/4; - unsigned int max_nr_writes = throtl_grp_quantum - max_nr_reads; + unsigned int max_nr_reads = THROTL_GRP_QUANTUM * 3 / 4; + unsigned int max_nr_writes = THROTL_GRP_QUANTUM - max_nr_reads; struct bio *bio; /* Try to dispatch 75% READS and 25% WRITES */ @@ -1226,7 +1226,7 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq) if (sq->nr_queued[0] || sq->nr_queued[1]) tg_update_disptime(tg); - if (nr_disp >= throtl_quantum) + if (nr_disp >= THROTL_QUANTUM) break; } |