lkml.org 
[lkml]   [2013]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] mm: add overcommit_kbytes sysctl variable
On 08/19/2013 08:17 AM, Jerome Marchand wrote:
> Some applications that run on HPC clusters are designed around the
> availability of RAM and the overcommit ratio is fine tuned to get the
> maximum usage of memory without swapping. With growing memory, the
> 1%-of-all-RAM grain provided by overcommit_ratio has become too coarse
> for these workload (on a 2TB machine it represents no less than
> 20GB).
>
> This patch adds the new overcommit_kbytes sysctl variable that allow a
> much finer grain.

Instead of introducing yet another tunable, why don't we just make the
ratio that comes in from the user more fine-grained?

sysctl overcommit_ratio=0.2

We change the internal 'sysctl_overcommit_ratio' to store tenths or
hundreths of a percent (or whatever), then parse the input as two
integers. I don't think we need fully correct floating point parsing
and rounding here, so it shouldn't be too much of a chore. It'd
probably end up being less code than you have as it stands.


\
 
 \ /
  Last update: 2013-08-19 19:21    [W:0.076 / U:0.396 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site