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authorChristoph Hellwig <hch@lst.de>2019-06-06 13:26:21 +0300
committerJens Axboe <axboe@kernel.dk>2019-06-20 19:32:34 +0300
commit7af6fd9112ba310a889c60d0606b4b74049cfe14 (patch)
tree82110ea85453bdc5860bdba93d791f8f367070e7 /block/bfq-cgroup.c
parent5d0b6e48cbef3219c0ed75e0e746c4ed259303c2 (diff)
downloadlinux-7af6fd9112ba310a889c60d0606b4b74049cfe14.tar.xz
blk-cgroup: introduce a new struct blkg_rwstat_sample
When sampling the blkcg counts we don't need atomics or per-cpu variables. Introduce a new structure just containing plain u64 counters. Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bfq-cgroup.c')
-rw-r--r--block/bfq-cgroup.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index 66abc82179f3..624374a99c6e 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -935,7 +935,7 @@ static u64 bfqg_prfill_stat_recursive(struct seq_file *sf,
static u64 bfqg_prfill_rwstat_recursive(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
{
- struct blkg_rwstat sum;
+ struct blkg_rwstat_sample sum;
blkg_rwstat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_bfq, off, &sum);
return __blkg_prfill_rwstat(sf, pd, &sum);
@@ -975,15 +975,13 @@ static int bfqg_print_stat_sectors(struct seq_file *sf, void *v)
static u64 bfqg_prfill_sectors_recursive(struct seq_file *sf,
struct blkg_policy_data *pd, int off)
{
- struct blkg_rwstat tmp;
- u64 sum;
+ struct blkg_rwstat_sample tmp;
blkg_rwstat_recursive_sum(pd->blkg, NULL,
offsetof(struct blkcg_gq, stat_bytes), &tmp);
- sum = atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_READ]) +
- atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_WRITE]);
- return __blkg_prfill_u64(sf, pd, sum >> 9);
+ return __blkg_prfill_u64(sf, pd,
+ (tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE]) >> 9);
}
static int bfqg_print_stat_sectors_recursive(struct seq_file *sf, void *v)