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Commit 1a36e59d authored by Sha Zhengju's avatar Sha Zhengju Committed by Linus Torvalds
Browse files

memcg: reduce function dereference 



This function dereferences res far too often, so optimize it.

Signed-off-by: default avatarSha Zhengju <handai.szj@taobao.com>
Signed-off-by: default avatarQiang Huang <h.huangqiang@huawei.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Jeff Liu <jeff.liu@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3af33516

kernel/res_counter.c

+11 −8
Original line number Diff line number Diff line
@@ -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;

}