linux-kernel - Re: [PATCH v3] mm/page_owner: use kvmalloc instead of kmalloc

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Message-ID: <20181101102734.GF23921@dhcp22.suse.cz>
Date:   Thu, 1 Nov 2018 11:27:34 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Miles Chen <miles.chen@...iatek.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Joe Perches <joe@...ches.com>,
        Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH v3] mm/page_owner: use kvmalloc instead of kmalloc

On Thu 01-11-18 18:00:12, Miles Chen wrote:
[...]
> I did a test today, the only code changed is to clamp to read count to
> PAGE_SIZE and it worked well. Maybe we can solve this issue by just
> clamping the read count.
> 
> count = count > PAGE_SIZE ? PAGE_SIZE : count;

This i what Matthew was proposing AFAIR. At least as a stop gap
solution. Maybe we want to extend this to a more standard implementation
later on (e.g. seq_file).
-- 
Michal Hocko
SUSE Labs