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

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Date:   Tue, 30 Oct 2018 09:15:37 +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 Tue 30-10-18 14:55:51, Miles Chen wrote:
[...]
> It's a real problem when using page_owner.
> I found this issue recently: I'm not able to read page_owner information
> during a overnight test. (error: read failed: Out of memory). I replace
> kmalloc() with vmalloc() and it worked well.

Is this with trimming the allocation to a single page and doing shorter
than requested reads?
-- 
Michal Hocko
SUSE Labs