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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>
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@ -178,27 +178,30 @@ u64 res_counter_read_u64(struct res_counter *counter, int member)
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#endif
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int res_counter_memparse_write_strategy(const char *buf,
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unsigned long long *res)
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unsigned long long *resp)
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{
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char *end;
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unsigned long long res;
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/* return RES_COUNTER_MAX(unlimited) if "-1" is specified */
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if (*buf == '-') {
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*res = simple_strtoull(buf + 1, &end, 10);
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if (*res != 1 || *end != '\0')
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res = simple_strtoull(buf + 1, &end, 10);
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if (res != 1 || *end != '\0')
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return -EINVAL;
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*res = RES_COUNTER_MAX;
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*resp = RES_COUNTER_MAX;
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return 0;
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}
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*res = memparse(buf, &end);
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res = memparse(buf, &end);
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if (*end != '\0')
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return -EINVAL;
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if (PAGE_ALIGN(*res) >= *res)
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*res = PAGE_ALIGN(*res);
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if (PAGE_ALIGN(res) >= res)
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res = PAGE_ALIGN(res);
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else
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*res = RES_COUNTER_MAX;
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res = RES_COUNTER_MAX;
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*resp = res;
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return 0;
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}
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