On Sat, Apr 09, 2022 at 09:53:09AM +0200, Peter Zijlstra wrote:
> On Sat, Apr 09, 2022 at 01:43:44AM +0000, cgel.zte@xxxxxxxxx wrote:
> > From: Yang Yang <yang.yang29@xxxxxxxxxx>
> >
> > Delay accounting does not track the delay of write-protect copy. When
> > tasks trigger many write-protect copys(include COW and unsharing of
> > anonymous pages[1]), it may spend a amount of time waiting for them.
> > To get the delay of tasks in write-protect copy, could help users to
> > evaluate the impact of using KSM or fork() or GUP.
> >
> > Also update tools/accounting/getdelays.c:
> >
> > / # ./getdelays -dl -p 231
> > print delayacct stats ON
> > listen forever
> > PID 231
> >
> > CPU count real total virtual total delay total delay average
> > 6247 1859000000 2154070021 1674255063 0.268ms
> > IO count delay total delay average
> > 0 0 0ms
> > SWAP count delay total delay average
> > 0 0 0ms
> > RECLAIM count delay total delay average
> > 0 0 0ms
> > THRASHING count delay total delay average
> > 0 0 0ms
> > COMPACT count delay total delay average
> > 3 72758 0ms
> > WPCOPY count delay total delay average
> > 3635 271567604 0ms
> >
> > [1] commit 31cc5bc4af70("mm: support GUP-triggered unsharing of anonymous pages")
> >
> > Signed-off-by: Yang Yang <yang.yang29@xxxxxxxxxx>
> > Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
> > Reviewed-by: Jiang Xuexin <jiang.xuexin@xxxxxxxxxx>
> > Reviewed-by: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
> > Reviewed-by: wangyong <wang.yong12@xxxxxxxxxx>
>
> As per always; I refuse to take patches from cgel.zte@xxxxxxxxx. Because
> yet again From and Sender don't match.
>
> If you want me to consider your email, please send from the email
> address you've listed in your SoB.
Very sorry to have this problem, because our company's mail system
(xx.zte.com.cn)has a little format problem, so we use gmail instead.
We do want to do a little work for the community, so sent patches
before it fixed. I will try to connect our mail system administrator
to solve it next time.
For this patch, it had been modified for several times, special thanks
to David Hildenbrand, so we hope to merge it(if no other problem).
Thanks!
