lkml.org 
[lkml]   [2020]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3] mm: fix tick timer stall during deferred page init
On Thu, Mar 19, 2020 at 03:05:12PM -0400, Daniel Jordan wrote:
> Regardless,
> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>

Darn, I spoke too soon.

On a two-socket Xeon, smaller values of TICK_PAGE_COUNT caused the deferred
init timestamp to grow by over 25%. This was with pgdatinit0 bound to the
timer interrupt CPU to make sure the issue always reproduces.

TICK_PAGE_COUNT node 0 deferred
init time (ms)
--------------- ---------------
4096 610
8192 587
16384 487
32768 480 // used in the patch

Instead of trying to find a constant that lets the timer interrupt run often
enough, I think a better way forward is to reconsider how we handle the resize
lock. I plan to prototype something and reply back with what I get.

\
 
 \ /
  Last update: 2020-03-26 19:59    [W:0.126 / U:11.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site