Commit d014172f authored by Lu Jialin's avatar Lu Jialin Committed by Zheng Zengkai
Browse files

memcg: Modify memory.high_async_ratio changing scope 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4IMAK


CVE: NA

--------

This patch changes HIGH_ASYNC_RATIO_BASE from 10 to 100 and changes
HIGH_ASYNC_RATIO_GAP from 1 to 10.
After this patch, user can set high_async_ratio from 0 to 99, which will
make memcg async reclaim more delicacy management.
If high_async_ratio is smaller than 10, try to reclaim all the pages of the
memcg.

Signed-off-by: default avatarLu Jialin <lujialin4@huawei.com>
Reviewed-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent b901af70

mm/memcontrol.c

+8 −5
Original line number Diff line number Diff line
@@ -119,8 +119,8 @@ static bool do_memsw_account(void) 
 */



#define HIGH_ASYNC_RATIO_DEFAULT		0

#define HIGH_ASYNC_RATIO_BASE			10

#define HIGH_ASYNC_RATIO_GAP			1

#define HIGH_ASYNC_RATIO_BASE			100

#define HIGH_ASYNC_RATIO_GAP			10



/*

 * Cgroups above their limits are maintained in a RB-Tree, independent of
@@ -2405,8 +2405,11 @@ static unsigned long reclaim_high(struct mem_cgroup *memcg, 
static unsigned long get_reclaim_pages(struct mem_cgroup *memcg)

{

	unsigned long nr_pages = page_counter_read(&memcg->memory);

	int ratio = READ_ONCE(memcg->high_async_ratio) - HIGH_ASYNC_RATIO_GAP;

	unsigned long safe_pages = READ_ONCE(memcg->memory.high) * ratio /

	int ratio = READ_ONCE(memcg->high_async_ratio);

	unsigned long safe_pages;



	ratio = ratio < HIGH_ASYNC_RATIO_GAP ? 0 : ratio - HIGH_ASYNC_RATIO_GAP;

	safe_pages = READ_ONCE(memcg->memory.high) * ratio /

		     HIGH_ASYNC_RATIO_BASE;



	return (nr_pages > safe_pages) ? (nr_pages - safe_pages) :