linux-kernel - Re: [PATCH] vmalloc: add warning in _

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Message-ID: <1336029206.13013.11.camel@sauron.fi.intel.com>
Date:	Thu, 03 May 2012 10:13:26 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Nick Piggin <npiggin@...il.com>
Cc:	Sage Weil <sage@...dream.net>, Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kosaki.motohiro@...il.com,
	rientjes@...gle.com, Neil Brown <neilb@...e.de>,
	David Woodhouse <dwmw2@...radead.org>,
	Theodore Ts'o <tytso@....edu>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	James Morris <jmorris@...ei.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] vmalloc: add warning in __vmalloc

On Thu, 2012-05-03 at 16:30 +1000, Nick Piggin wrote:
> Note that in writeback paths, a "good citizen" filesystem should not require
> any allocations, or at least it should be able to tolerate allocation failures.
> So fixing that would be a good idea anyway.

This is a good point, but UBIFS kmallocs(GFP_NOFS) when doing I/O
because it needs to compress/decompress. But I agree that if kmalloc
fails, we should have a fall-back reserve buffer protected by a mutex
for memory pressure situations.

-- 
Best Regards,
Artem Bityutskiy

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