From: Arnd Bergmann Date: Tue, 16 Jan 2018 15:01:36 +0000 (+0100) Subject: blkcg: simplify statistic accumulation code X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ddc212313f16cd65fcf5e8d9ae223f8374822e4d;p=linux.git 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: e6269c445467 ("blkcg: add blkg_[rw]stat->aux_cnt and replace cfq_group->dead_stats with it") Acked-by: Tejun Heo Signed-off-by: Arnd Bergmann Signed-off-by: Jens Axboe --- diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index e9825ff57b155..69bea82ebeb12 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -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]); }