Messages in this thread Patch in this message | | | Date | Fri, 4 Jul 2008 18:16:06 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | [PATCH 2/2] memcg: check limit change |
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Shrinking memory usage at limit change.
Changelog: v1 -> v2 - adjusted to be based on write_string() patch set fixed pointed out styles (below) - removed backword goto. - removed unneccesary cond_resched().
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Documentation/controllers/memory.txt | 3 -- mm/memcontrol.c | 43 +++++++++++++++++++++++++++++++---- 2 files changed, 40 insertions(+), 6 deletions(-)
Index: test-2.6.26-rc8-mm1/mm/memcontrol.c =================================================================== --- test-2.6.26-rc8-mm1.orig/mm/memcontrol.c +++ test-2.6.26-rc8-mm1/mm/memcontrol.c @@ -836,6 +836,26 @@ int mem_cgroup_shrink_usage(struct mm_st return 0; } +int mem_cgroup_resize_limit(struct mem_cgroup *memcg, unsigned long long val) +{ + + int retry_count = MEM_CGROUP_RECLAIM_RETRIES; + int progress; + int ret = 0; + + while (res_counter_set_limit(&memcg->res, val)) { + if (!retry_count) { + ret = -EBUSY; + break; + } + progress = try_to_free_mem_cgroup_pages(memcg, GFP_KERNEL); + if (!progress) + retry_count--; + } + return ret; +} + + /* * This routine traverse page_cgroup in given list and drop them all. * *And* this routine doesn't reclaim page itself, just removes page_cgroup. @@ -916,13 +936,29 @@ static u64 mem_cgroup_read(struct cgroup return res_counter_read_u64(&mem_cgroup_from_cont(cont)->res, cft->private); } - +/* + * The user of this function is... + * RES_LIMIT. + */ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, const char *buffer) { - return res_counter_write(&mem_cgroup_from_cont(cont)->res, - cft->private, buffer, - res_counter_memparse_write_strategy); + struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); + unsigned long long val; + int ret; + + switch (cft->private) { + case RES_LIMIT: + /* This function does all necessary parse...reuse it */ + ret = res_counter_memparse_write_strategy(buffer, &val); + if (!ret) + ret = mem_cgroup_resize_limit(memcg, val); + break; + default: + ret = -EINVAL; /* should be BUG() ? */ + break; + } + return ret; } static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) Index: test-2.6.26-rc8-mm1/Documentation/controllers/memory.txt =================================================================== --- test-2.6.26-rc8-mm1.orig/Documentation/controllers/memory.txt +++ test-2.6.26-rc8-mm1/Documentation/controllers/memory.txt @@ -242,8 +242,7 @@ rmdir() if there are no tasks. 1. Add support for accounting huge pages (as a separate controller) 2. Make per-cgroup scanner reclaim not-shared pages first 3. Teach controller to account for shared-pages -4. Start reclamation when the limit is lowered -5. Start reclamation in the background when the limit is +4. Start reclamation in the background when the limit is not yet hit but the usage is getting closer Summary
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