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To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
       x86@kernel.org, Nick Piggin <nickpiggin@yahoo.com.au>,
       Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb flushes to use function calls
From: Andi Kleen <andi@firstfloor.org>
References: <patchbomb.1217636085@localhost>
Date: Wed, 06 Aug 2008 05:22:56 +0200
In-Reply-To: <patchbomb.1217636085@localhost> (Jeremy Fitzhardinge's message of "Fri, 01 Aug 2008 17:14:45 -0700")
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Jeremy Fitzhardinge <jeremy@goop.org> writes:

> 1. use smp_call_function_mask to implement cross-cpu TLB flushes


Do you have any measurements comparing performance of the old and 
the new call? TLB flush is quite time critical so we should be very
careful here.

-Andi