From e5f32a3856caabe745381279f7f32e3b581b59dc Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 15 Oct 2007 17:00:18 +0200
Subject: [PATCH] sched: speed up context-switches a bit

speed up context-switches a bit by not clearing p->exec_start.

(as a side-effect, this also makes p->exec_start a universal timestamp
available to cache-hot estimations.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
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