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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>
This commit is contained in:
Baolin Wang 2020-09-07 16:10:15 +08:00 committed by Jens Axboe
parent ff8b22c0f2
commit e675df2adc
1 changed files with 5 additions and 5 deletions
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10
block/blk-throttle.c
View File

@ -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;
}