linux-kernel - Re: [PATCH 02/10] ARC: send ipi to all cpus sharing task mm in case of page fault

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Message-ID: <1495712165.5393.38.camel@synopsys.com>
Date:   Thu, 25 May 2017 11:36:06 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "noamca@...lanox.com" <noamca@...lanox.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH 02/10] ARC: send ipi to all cpus sharing task mm in case
 of page fault

Hi Noam,

On Thu, 2017-05-25 at 05:34 +0300, Noam Camus wrote:
> From: Noam Camus <noamca@...lanox.com>
> 
> This patch is derived due to performance issue.
> The use case is a page fault that resides on more than the local cpu.
> Trying to broadcast all CPUs results on performance degradation.
> So we try to avoid this by sending only to the relevant CPUs.
> 
> Signed-off-by: Noam Camus <noamca@...lanox.com>

Really nice catch!

Reviewed-by: Alexey Brodkin <abrodkin@...opsys.com>