linux-kernel - Re: [PATCH v2 3/7] mm, page_alloc: remove setup

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Message-ID: <a6d39f3b-3dea-3b97-018a-a53f07155d39@suse.cz>
Date:   Thu, 8 Oct 2020 14:56:13 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...e.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 3/7] mm, page_alloc: remove setup_pageset()

On 10/8/20 2:23 PM, Michal Hocko wrote:
> On Thu 08-10-20 13:41:57, Vlastimil Babka wrote:
>> We initialize boot-time pagesets with setup_pageset(), which sets high and
>> batch values that effectively disable pcplists.
>> 
>> We can remove this wrapper if we just set these values for all pagesets in
>> pageset_init(). Non-boot pagesets then subsequently update them to the proper
>> values.
>> 
>> No functional change.
>> 
>> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
>> Reviewed-by: David Hildenbrand <david@...hat.com>
> 
> Acked-by: Michal Hocko <mhocko@...e.com>

Thanks!

> Btw. where do we initialize pcp->count? I thought that pcp allocator
> zeroes out the allocated memory but alloc_percpu is GFP_KERNEL like.

pageset_init() does:
memset(p, 0, sizeof(*p))