linux-kernel - Re: [PATCH] nohz: Remove update_ts_time_stat from tick_nohz_start

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Message-ID: <20111202095756.GB15975@linux.vnet.ibm.com>
Date:	Fri, 2 Dec 2011 15:27:56 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] nohz: Remove update_ts_time_stat from
 tick_nohz_start_idle

* Michal Hocko <mhocko@...e.cz> [2011-12-01 17:00:22]:

> There is no reason to call update_ts_time_stat from tick_nohz_start_idle
> anymore (after e0e37c20 sched: Eliminate the ts->idle_lastupdate field)
> when we updated idle_lastupdate unconditionally.
> 
> We haven't set idle_active yet and do not provide last_update_time so
> the whole call end up being just 2 wasted branches.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>
> CC: Arjan van de Ven <arjan@...ux.intel.com>
> CC: Thomas Gleixner <tglx@...utronix.de>

Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>

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