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From: Ming Lei <ming.lei@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <willy@infradead.org>,
	Christopher Lameter <cl@linux.com>,
	Michal Hocko <mhocko@kernel.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Dave Chinner <david@fromorbit.com>,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-block@vger.kernel.org,
	James Bottomley <James.Bottomley@hansenpartnership.com>,
	linux-btrfs@vger.kernel.org
Subject: Re: [PATCH v2 2/2] mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two)
Date: Wed, 4 Sep 2019 14:40:44 +0800	[thread overview]
Message-ID: <20190904064043.GA7578@ming.t460p> (raw)
In-Reply-To: <20190904051933.GA10218@lst.de>

On Wed, Sep 04, 2019 at 07:19:33AM +0200, Christoph Hellwig wrote:
> On Tue, Sep 03, 2019 at 01:53:12PM -0700, Matthew Wilcox wrote:
> > > Its enabled in all full debug session as far as I know. Fedora for
> > > example has been running this for ages to find breakage in device drivers
> > > etc etc.
> > 
> > Are you telling me nobody uses the ramdisk driver on fedora?  Because
> > that's one of the affected drivers.
> 
> For pmem/brd misaligned memory alone doesn't seem to be the problem.
> Misaligned memory that cross a page barrier is.  And at least XFS
> before my log recovery changes only used kmalloc for smaller than
> page size allocation, so this case probably didn't hit.

BTW, does sl[aou]b guarantee that smaller than page size allocation via kmalloc()
won't cross page boundary any time?

Thanks,
Ming

  reply	other threads:[~2019-09-04  6:41 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-26 11:16 [PATCH v2 0/2] guarantee natural alignment for kmalloc() Vlastimil Babka
2019-08-26 11:16 ` [PATCH v2 1/2] mm, sl[ou]b: improve memory accounting Vlastimil Babka
2019-08-26 11:16 ` [PATCH v2 2/2] mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two) Vlastimil Babka
2019-08-28 18:45   ` Christopher Lameter
2019-08-28 18:45     ` Christopher Lameter
2019-08-28 19:46     ` Matthew Wilcox
2019-08-28 22:24       ` Dave Chinner
2019-08-29  7:56         ` Vlastimil Babka
2019-08-30  0:29           ` Dave Chinner
2019-08-29  7:39       ` Michal Hocko
2019-08-30 17:41         ` Christopher Lameter
2019-08-30 17:41           ` Christopher Lameter
2019-09-01  0:52           ` Matthew Wilcox
2019-09-03 20:13             ` Christopher Lameter
2019-09-03 20:13               ` Christopher Lameter
2019-09-03 20:53               ` Matthew Wilcox
2019-09-04  5:19                 ` Christoph Hellwig
2019-09-04  6:40                   ` Ming Lei [this message]
2019-09-04  7:20                     ` Vlastimil Babka
2019-09-04 19:31                 ` Christopher Lameter
2019-09-04 19:31                   ` Christopher Lameter
2019-09-23 16:36   ` Vlastimil Babka
2019-09-23 17:17     ` David Sterba
2019-09-23 17:51       ` Darrick J. Wong
2019-09-24 20:47         ` cl
2019-09-24 20:47           ` cl
2019-09-24 20:51           ` Matthew Wilcox
2019-09-24 20:55             ` cl
2019-09-24 20:55               ` cl
2019-09-26 13:02               ` David Sterba
2019-09-24 21:19         ` Vlastimil Babka
2019-09-24 21:53           ` Dave Chinner
2019-09-24 22:21             ` Darrick J. Wong
2019-09-24 20:52       ` cl
2019-09-24 20:52         ` cl
2019-09-24 23:54         ` Andrew Morton
2019-09-25  7:17           ` Vlastimil Babka
2019-09-26  0:16             ` Christopher Lameter
2019-09-26  0:16               ` Christopher Lameter
2019-09-26  0:14           ` Christopher Lameter
2019-09-26  0:14             ` Christopher Lameter
2019-09-26  7:41             ` Vlastimil Babka
2019-09-28  1:12               ` Christopher Lameter
2019-09-28  1:12                 ` Christopher Lameter
2019-09-30 13:32                 ` Matthew Wilcox
2019-09-23 17:54     ` Roman Gushchin
2019-09-30  8:06     ` Christoph Hellwig
2019-09-30  9:23     ` Michal Hocko
2019-09-30  9:32       ` Kirill A. Shutemov
2019-09-23 18:57   ` Matthew Wilcox

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