As the cgroup is now say 400M and i create/write a file of 8G. My point was due
to 400M limit in my group, the write should create a lot of memory pressure and
there by start the pager/shrinker activity desperately and slow down the
entire write throughput. ( file does get created but performance should be far
worse that without running with cgroups.) is't it ?
On Monday, January 19, 2015 3:52 PM, Holger Amann <[email protected]>
wrote:
Why shouldn’t it be possible to create a file with size >
$some_cgroup_page_cache_memory_limit? What’s the point here?
> Am 16.01.2015 um 20:32 schrieb Serge Hallyn <[email protected]>:
>
> Yes, I believe you need to use the kmem limits for that. Those are afaik
> not yet fully supported, sadly, but my ubuntu utopic host at least has
> them available: memory.kmem.limit_in_bytes etc
>
> Quoting Mohan G ([email protected]):
>> Hi,I created a cgroup and set memory limit as 400M. And i ran my test
>> program which is under this group to create a file of size 8G. ( thinking
>> that the amount of page cache pages needed at any point of time can exceed
>> 400M). But i did not have any issues and the file got created. So my
>> question is do these memory limits only apply to non file based operations.
>> ie (page cache is not accounted for ?). The question is relevant to
>> containers too.. ( same logic applies here too).
>> RegardsMohan
>>
>
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