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

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Message-ID: <CAM_iQpXd6_1Ry1WxfMUbjnwhm=7teM8NHsgutw_qHvgjwU78TA@mail.gmail.com>
Date:	Thu, 25 Jun 2015 11:40:46 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.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 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?
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