linux-kernel - Re: [v3 0/9] parallelized "struct page" zeroing

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Message-Id: <20170511.103538.1094530388932292836.davem@davemloft.net>
Date:   Thu, 11 May 2017 10:35:38 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     mhocko@...nel.org
Cc:     pasha.tatashin@...cle.com, linux-kernel@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-mm@...ck.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        borntraeger@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [v3 0/9] parallelized "struct page" zeroing

From: Michal Hocko <mhocko@...nel.org>
Date: Thu, 11 May 2017 10:05:38 +0200

> Anyway, do you agree that doing the struct page initialization along
> with other writes to it shouldn't add a measurable overhead comparing
> to pre-zeroing of larger block of struct pages?  We already have an
> exclusive cache line and doing one 64B write along with few other stores
> should be basically the same.

Yes, it should be reasonably cheap.