linux-kernel - Re: [PATCH] proc/schedstat: Expose /proc/<pid>/schedstat if delay accounting is enabled

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Message-ID: <20150626083933.GB15883@naverao1-tp.in.ibm.com>
Date:	Fri, 26 Jun 2015 14:09:33 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Balbir Singh <bsingharora@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] proc/schedstat: Expose /proc/<pid>/schedstat if delay
 accounting is enabled

On 2015/06/25 11:40AM, Cong Wang wrote:
> On Thu, Jun 25, 2015 at 11:27 AM, Naveen N. Rao
> <naveen.n.rao@...ux.vnet.ibm.com> wrote:
> >
> > The primary issue with CONFIG_SCHEDSTATS is the (slight) additional
> > overhead it introduces, per Kconfig. Due to this, it is not enabled by
> > default by some of the distro kernels.
> >
> 
> The overhead is same for CONFIG_TASK_DELAY_ACCT since the
> core sched info code is protected by CONFIG_TASK_DELAY_ACCT
> or CONFIG_TASK_DELAY_ACCT?

CONFIG_SCHEDSTATS enables a lot more scheduler statistics 
(/proc/schedstat) than just the task delay accounting enabled by 
CONFIG_TASK_DELAY_ACCT. So, no - the overhead is not the same.

- Naveen

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