lkml.org 
[lkml]   [2019]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 0/3] vmalloc enhancements
On Tue, Feb 12, 2019 at 09:56:45AM -0800, Roman Gushchin wrote:
> The patchset contains few changes to the vmalloc code, which are
> leading to some performance gains and code simplification.
>
> Also, it exports a number of pages, used by vmalloc(),
> in /proc/meminfo.
>
> Patch (1) removes some redundancy on __vunmap().
> Patch (2) separates memory allocation and data initialization
> in alloc_vmap_area()
> Patch (3) adds vmalloc counter to /proc/meminfo.
>
> v2->v1:
> - rebased on top of current mm tree
> - switch from atomic to percpu vmalloc page counter

I don't understand what prompted this change to percpu counters.

All writers already write vmap_area_lock and vmap_area_list, so it's
not really saving much. The for_each_possible_cpu() for /proc/meminfo
on the other hand is troublesome.

\
 
 \ /
  Last update: 2019-02-12 19:47    [W:0.069 / U:0.196 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site