linux-kernel - Re: [PATCH 03/18] mm: make vm

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Message-ID: <20160311123209.GJ27701@dhcp22.suse.cz>
Date:	Fri, 11 Mar 2016 13:32:09 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Alex Deucher <alexander.deucher@....com>,
	Alex Thorlton <athorlton@....com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Christian König <christian.koenig@....com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	Davidlohr Bueso <dave@...olabs.net>,
	David Rientjes <rientjes@...gle.com>,
	"H . Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	linux-arch@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Petr Cermak <petrcermak@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 03/18] mm: make vm_munmap killable

On Fri 11-03-16 11:06:41, Vlastimil Babka wrote:
> On 02/29/2016 02:26 PM, Michal Hocko wrote:
> >From: Michal Hocko <mhocko@...e.com>
> >
> >Almost all current users of vm_munmap are ignoring the return value
> >and so they do not handle potential error. This means that some VMAs
> 
>    1   7834  arch/x86/kvm/x86.c <<__x86_set_memory_region>>
> 
>              r = vm_munmap(old.userspace_addr, old.npages * PAGE_SIZE);
>              WARN_ON(r < 0);
> 
> This warning will potentially add noise to OOM output?

Would it be harmfull though? I mean the warning is just goofy. I can
make it not warn on (r < 0 && r != -EINTR) but is it worth bothering?

Thanks!
-- 
Michal Hocko
SUSE Labs