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| author | Sha Zhengju <handai.szj@taobao.com> | 2013-09-13 00:13:49 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-13 00:38:02 +0200 |
| commit | 1a36e59d4833de19120dc7482c61ef69e228c73c (patch) | |
| tree | 85b815d4b6a461d56d4a0a450e31fa069c7c1142 /kernel/res_counter.c | |
| parent | memcg: avoid overflow caused by PAGE_ALIGN (diff) | |
| download | linux-1a36e59d4833de19120dc7482c61ef69e228c73c.tar.xz linux-1a36e59d4833de19120dc7482c61ef69e228c73c.zip | |
memcg: reduce function dereference
This function dereferences res far too often, so optimize it.
Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Jeff Liu <jeff.liu@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/res_counter.c')
| -rw-r--r-- | kernel/res_counter.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/kernel/res_counter.c b/kernel/res_counter.c index 085d3ae478fe..4aa8a305aede 100644 --- a/kernel/res_counter.c +++ b/kernel/res_counter.c @@ -178,27 +178,30 @@ u64 res_counter_read_u64(struct res_counter *counter, int member) #endif int res_counter_memparse_write_strategy(const char *buf, - unsigned long long *res) + unsigned long long *resp) { char *end; + unsigned long long res; /* return RES_COUNTER_MAX(unlimited) if "-1" is specified */ if (*buf == '-') { - *res = simple_strtoull(buf + 1, &end, 10); - if (*res != 1 || *end != '\0') + res = simple_strtoull(buf + 1, &end, 10); + if (res != 1 || *end != '\0') return -EINVAL; - *res = RES_COUNTER_MAX; + *resp = RES_COUNTER_MAX; return 0; } - *res = memparse(buf, &end); + res = memparse(buf, &end); if (*end != '\0') return -EINVAL; - if (PAGE_ALIGN(*res) >= *res) - *res = PAGE_ALIGN(*res); + if (PAGE_ALIGN(res) >= res) + res = PAGE_ALIGN(res); else - *res = RES_COUNTER_MAX; + res = RES_COUNTER_MAX; + + *resp = res; return 0; } |