Messages in this thread | | | From | Zhu Yanhai <> | Date | Fri, 25 May 2012 14:11:26 +0800 | Subject | Re: About cgroup memory limits |
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2012/5/25 Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>: > (2012/05/25 13:16), Zhu Yanhai wrote: >> >> 2012/5/10 KAMEZAWA Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com>: >>> >>> (2012/05/10 3:37), Andre Nathan wrote: >>> >>>> Hello >>>> >>>> I'm doing some tests with LXC and how it interacts with the memory >>>> cgroup limits, more specifically the memory.limit_in_bytes control file. >>>> >>>> Am I correct in my understanding of the memory cgroup documentation[1] >>>> that the limit set in memory.limit_in_bytes is applied to the sum of the >>>> fields 'cache', 'rss' and 'mapped_file' in the memory.stat file? >>>> >>> >>> cache includes mapped_file. Then, >> >> >> Excuse me, but it does read: >> >> switch (ctype) { >> case MEM_CGROUP_CHARGE_TYPE_CACHE: >> case MEM_CGROUP_CHARGE_TYPE_SHMEM: >> SetPageCgroupCache(pc); >> SetPageCgroupUsed(pc); >> break; >> case MEM_CGROUP_CHARGE_TYPE_MAPPED: >> ClearPageCgroupCache(pc); >> SetPageCgroupUsed(pc); >> break; >> default: >> break; >> } >> mem_cgroup_charge_statistics(mem, pc, page_size); >> >> And then, in mem_cgroup_charge_statistics() we have : >> >> if (PageCgroupCache(pc)) >> __mem_cgroup_stat_add_safe(cpustat, >> MEM_CGROUP_STAT_CACHE, numpages); >> else >> __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_RSS, >> numpages); >> >> So it seems that rss includes mapped_file, not cache? >> > Why you think so ? mapped_file is mapped file cache. All file caches > are accountned as STAT_CACHE. > > > TYPE_MAPPDED doesn't mean mapped_file. > In above, TYPE_MAPPED is called via anonymous page fault. > It represents anonymous page, counted as RSS. > I wonder it may be better to rename these macros.
Got it, really get confused by the name! Thanks. > > > Thanks, > -Kame > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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