From: Michal Hocko <mhocko@kernel.org>
Subject: [DEBUG PATCH 0/2] debug explicit GFP_NO{FS,IO} usage from the scope context
Date: Fri, 16 Dec 2016 13:46:26 +0100
Message-ID: <20161216124628.26846-1-mhocko@kernel.org>
References: <20161215140715.12732-1-mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Dave Chinner <david@fromorbit.com>,
	"Theodore Ts'o" <tytso@mit.edu>,
	Chris Mason <clm@fb.com>,
	David Sterba <dsterba@suse.cz>,
	Jan Kara <jack@suse.cz>,
	ceph-devel@vger.kernel.org,
	cluster-devel@redhat.com,
	linux-nfs@vger.kernel.org,
	logfs@logfs.org,
	linux-xfs@vger.kernel.org,
	linux-ext4@vger.kernel.org,
	linux-btrfs@vger.kernel.org,
	linux-mtd@lists.infradead.org,
	reiserfs-devel@vger.kernel.org,
	linux-ntfs-dev@lists.sourceforge.net,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-afs@lists.infradead.org,
	LKML <linux-kernel@vger.kernel.org>
To: <linux-mm@kvack.org>,
	<linux-fsdevel@vger.kernel.org>
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <20161215140715.12732-1-mhocko@kernel.org>
Sender: owner-linux-mm@kvack.org
List-Id: linux-ext4.vger.kernel.org

Hi,
I've forgot to add the following two patches which should help to
identify explicit GFP_NO{FS,IO} usage from withing a scope context. Such
a usage can be changed to the full GFP_KERNEL because all the calls
from within the NO{FS,IO} scope will drop the __GFP_FS resp. __GFP_IO
automatically and if the function is called outside of the scope then
we do not need to restrict it to NOFS/NOIO as long as all the reclaim
recursion unsafe contexts are marked properly. This means that each
such a reported allocation site has to be checked before converted.

The debugging has to be enabled explicitly by a kernel command line
parameter and then it reports the stack trace of the allocation and
also the function which has started the current scope.

These two patches are _not_ intended to be merged and they are only
aimed at debugging.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>