lkml.org 
[lkml]   [2021]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/3] blk-mq: Always complete remote completions requests in softirq
On Mon, Jan 25, 2021 at 08:10:16AM +0100, Hannes Reinecke wrote:
> I don't get this.
> This code is about _avoiding_ having to raise a softirq if the driver
> exports more than one hardware queue.
> So where exactly does the remote CPU case come in here?

__blk_mq_complete_request_remote is only called for the case where we
do not completelky locally. The case that "degrades" here is where
the device supports multiple queues, but less than the number of CPUs,
and we bounce the completion to another CPU.

\
 
 \ /
  Last update: 2021-01-26 21:58    [W:0.109 / U:0.160 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site