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blkcg: simplify statistic accumulation code 

Some older compilers (gcc-4.4 through 4.6 in particular) struggle
with the way that blkg_rwstat_read() returns a structure, leading
to excessive stack usage and rather inefficient code:

block/blk-cgroup.c: In function 'blkg_destroy':
block/blk-cgroup.c:354:1: error: the frame size of 1296 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
block/cfq-iosched.c: In function 'cfqg_stats_add_aux':
block/cfq-iosched.c:753:1: error: the frame size of 1928 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
block/bfq-cgroup.c: In function 'bfqg_stats_add_aux':
block/bfq-cgroup.c:299:1: error: the frame size of 1928 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

I also notice that there is no point in using atomic accesses
for the local variables, so storing the temporaries in simple 'u64'
variables not only avoids the stack usage on older compilers but
also improves the object code on modern versions.

Fixes: e6269c4454 ("blkcg: add blkg_[rw]stat->aux_cnt and replace cfq_group->dead_stats with it")
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Arnd Bergmann 2018-01-16 16:01:36 +01:00 committed by Jens Axboe
parent c100ec49fd
commit ddc212313f
1 changed files with 5 additions and 3 deletions
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8
include/linux/blk-cgroup.h
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@ -660,12 +660,14 @@ static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat)
static inline void blkg_rwstat_add_aux(struct blkg_rwstat *to,
struct blkg_rwstat *from)
{
struct blkg_rwstat v = blkg_rwstat_read(from);
u64 sum[BLKG_RWSTAT_NR];
int i;
for (i = 0; i < BLKG_RWSTAT_NR; i++)
atomic64_add(atomic64_read(&v.aux_cnt[i]) +
atomic64_read(&from->aux_cnt[i]),
sum[i] = percpu_counter_sum_positive(&from->cpu_cnt[i]);
for (i = 0; i < BLKG_RWSTAT_NR; i++)
atomic64_add(sum[i] + atomic64_read(&from->aux_cnt[i]),
&to->aux_cnt[i]);
}