linux-kernel - Re: [git pull] vfs.git bits and pieces

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Date:	Wed, 20 Nov 2013 14:40:14 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [git pull] vfs.git bits and pieces

On Wed, 20 Nov 2013 14:33:35 -0800 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Wed, Nov 20, 2013 at 9:47 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> > BTW, something odd happened to mm/memory.c - either a mangled patch
> > or a lost followup:
> >
> >     commit ea1e7ed33708
> >     mm: create a separate slab for page->ptl allocation
> >
> > Fair enough, and yes, it does create that separate slab.  The problem is,
> > it's still using kmalloc/kfree for those beasts - page_ptl_cachep isn't
> > used at all...
> 
> Ok, it looks straightforward enough to just replace the kmalloc/kfree
> with using a slab allocation using the page_ptl_cachep pointer. I'd do
> it myself, but I would like to know how it got lost? Also, much
> testing to make sure the cachep is initialized early enough.

agh, I went through hell keeping that patch alive and it appears I lost
some of it.

> Or should we just revert the commit that added the pointless/unused
> slab pointer?
> 
> Andrew, Kirill, comments?

Let's just kill it please.  We can try again for 3.14.

> Also note the other issue Al found: see commit 2a46eed54a28 ("Wrong
> page freed on preallocate_pmds() failure exit") that I just pushed
> out.

lgtm, thanks.
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