lkml.org 
[lkml]   [2019]   [Apr]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] iommu/iova: Separate atomic variables to improve performance
On Wed, Apr 03, 2019 at 04:35:21PM +0800, Shaokun Zhang wrote:
> From: Jinyu Qi <jinyuqi@huawei.com>
>
> In struct iova_domain, there are three atomic variables, the former two
> are about TLB flush counters which use atomic_add operation, anoter is
> used to flush timer that use cmpxhg operation.
> These variables are in the same cache line, so it will cause some
> performance loss under the condition that many cores call queue_iova
> function, Let's isolate the two type atomic variables to different
> cache line to reduce cache line conflict.
>
> Cc: Joerg Roedel <joro@8bytes.org>
> Signed-off-by: Jinyu Qi <jinyuqi@huawei.com>
> ---
> include/linux/iova.h | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)

Applied, thanks.

\
 
 \ /
  Last update: 2019-04-11 15:43    [W:0.044 / U:1.856 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site