lkml.org 
[lkml]   [2012]   [Jun]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH -V6 07/14] memcg: Add HugeTLB extension
On Mon, Jun 11, 2012 at 2:23 AM, David Rientjes <rientjes@google.com> wrote:
> On Mon, 11 Jun 2012, Kamezawa Hiroyuki wrote:
>
>> Now, I think...
>>
>>   1. I need to agree that overhead is _not_ negligible.
>>
>>   2. THP should be the way rather than hugetlb for my main target platform.
>>      (shmem/tmpfs should support THP. we need study.)
>>      user-experience should be fixed by THP+tmpfs+memcg.
>>
>>   3. It seems Aneesh decided to have independent hugetlb cgroup.
>>
>> So, now, I admit to have independent hugetlb cgroup.
>> Other opinions ?
>>
>
> I suggested the seperate controller in the review of the patchset so I
> obviously agree with your conclusion.  I don't think we should account for
> hugetlb pages in memory.usage_in_bytes and enforce memory.limit_in_bytes
> since 512 4K pages is not the same as 1 2M page which may be a sacred
> resource if fragmentation is high.
>
Based on the usecase at Google, I see a definite value in including
hugepage usage in memory.usage_in_bytes as well and having a single
limit for memory usage for the job. Our jobs wants to specify only one
(total) memory limit (including slab usage, and other kernel memory
usage, hugepages, etc.).

The hugepage/smallpage requirements of the job vary during its
lifetime. Having two different limits means less flexibility for jobs
as they now have to specify their limit as (max_hugepage,
max_smallpage) instead of max(hugepage + smallpage). Two limits
complicates the API for the users and requires them to over-specify
the resources.

> Many thanks to Aneesh for continuing to update the patchset and working
> toward a resolution on this, I love the direction its taking.
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

Thanks,
--
Aditya
--
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/

\
 
 \ /
  Last update: 2012-06-16 01:21    [W:0.238 / U:0.592 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site