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Date: Thu, 25 Jun 2015 11:40:46 -0700
Message-ID: <CAM_iQpXd6_1Ry1WxfMUbjnwhm=7teM8NHsgutw_qHvgjwU78TA@mail.gmail.com>
Subject: Re: [PATCH] proc/schedstat: Expose /proc/<pid>/schedstat if delay
 accounting is enabled
From: Cong Wang <xiyou.wangcong@gmail.com>
To: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Cc: Balbir Singh <bsingharora@gmail.com>, Ingo Molnar <mingo@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Thu, Jun 25, 2015 at 11:27 AM, Naveen N. Rao
<naveen.n.rao@linux.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?