linux-kernel - Re: [PATCH v6 0/3] Sched, KVM: st: Add steal time support to full dynticks CPU time accounting

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Date:	Mon, 13 Jun 2016 19:28:37 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	Wanpeng Li <wanpeng.li@...mail.com>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH v6 0/3] Sched, KVM: st: Add steal time support to full
 dynticks CPU time accounting

Cc maintainers/reviewers,
2016-06-13 18:32 GMT+08:00 Wanpeng Li <kernellwp@...il.com>:
> Periodic/NOHZ idle which don't use vtime have logic account steal time,
> however, vtime(depends on context tracking) which is just used in full
> dynticks doesn't account steal time, this patchset adds the steal time
> acccount support in vtime which will be used in full dynticks guest.
>
> Patch 1 and patch 2 fix steal clock warp and prev steal time account
> during cpu hotplug bugs.
> Patch 3 adds the steal time support to full dynticks CPU time accounting.
>
> N.B. This version of patchset drops previous Acked-by and Reviewed-by since
> they are different from earlier version. :)
>
> v5 -> v6:
>  * improve commit message of patch 2/3, 3/3
>  * fix account st twice
> v4 -> v5:
>  * improve commit message of patch 1/3
>  * revert commit e9532e69b8d1
>  * apply same logic to account_idle_time, so change get_vtime_delta instead
> v3 -> v4:
>  * fix grammar errors, thanks Ingo
>  * cleanup fragile codes, thanks Ingo
> v2 -> v3:
>  * fix the root cause
>  * convert steal time jiffies to cputime
> v1 -> v2:
>  * update patch subject, description and comments
>  * deal with the case where steal time suddenly increases by a ludicrous amount
>  * fix divide zero bug, thanks Rik
>
> Wanpeng Li (3):
>   KVM: fix steal clock warp during guest cpu hotplug
>   sched/cputime: Fix prev steal time accouting during cpu hotplug
>   sched/cputime: Add steal time support to full dynticks CPU time
>     accounting
>
>  arch/x86/kernel/kvm.c  |  2 --
>  kernel/sched/core.c    |  1 -
>  kernel/sched/cputime.c | 16 +++++++++-------
>  kernel/sched/sched.h   | 13 -------------
>  4 files changed, 9 insertions(+), 23 deletions(-)
>
> --
> 1.9.1
>