lkml.org 
[lkml]   [2021]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC 1/2] mm: disable LRU pagevec during the migration temporarily
On Wed, Feb 17, 2021 at 12:46:19PM -0800, Minchan Kim wrote:
> > I suspect you do not want to add atomic_read inside hot paths, right? Is
> > this really something that we have to microoptimize for? atomic_read is
> > a simple READ_ONCE on many archs.
>
> It's also spin_lock_irq_save in some arch. If the new synchonization is
> heavily compilcated, atomic would be better for simple start but I thought
> this locking scheme is too simple so no need to add atomic operation in
> readside.

What arch uses a spinlock for atomic_read()? I just had a quick grep and
didn't see any.

\
 
 \ /
  Last update: 2021-02-17 22:19    [W:0.083 / U:2.512 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site