linux-kernel - Re: [RFC, DEBUGGING 1/2] mm: pass NR_FILE_PAGES/NR_SHMEM into node_page

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Date:	Thu, 23 Jun 2016 17:56:57 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...riel.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC, DEBUGGING 1/2] mm: pass NR_FILE_PAGES/NR_SHMEM into node_page_state

On Thursday, June 23, 2016 2:51:11 PM CEST Mel Gorman wrote:
> On Thu, Jun 23, 2016 at 03:17:43PM +0200, Arnd Bergmann wrote:
> > > I have an alternative fix for this in a private tree. For now, I've asked
> > > Andrew to withdraw the series entirely as there are non-trivial collisions
> > > with OOM detection rework and huge page support for tmpfs.  It'll be easier
> > > and safer to resolve this outside of mmotm as it'll require a full round
> > > of testing which takes 3-4 days.
> > 
> > Ok. I've done a new version of my debug patch now, will follow up here
> > so you can do some testing on top of that as well if you like. We probably
> > don't want to apply my patch for the type checking, but you might find it
> > useful for your own testing.
> > 
> 
> It is useful. After fixing up a bunch of problems manually, it
> identified two more errors. I probably won't merge it but I'll hang on
> to it during development.

I'm glad it helps. On my randconfig build machine, I've also now run
into yet another finding that I originally didn't catch, not sure if you
found this one already:

In file included from ../include/linux/mm.h:999:0,
                 from ../include/linux/highmem.h:7,
                 from ../drivers/staging/lustre/lustre/osc/../../include/linux/libcfs/linux/libcfs.h:46,
                 from ../drivers/staging/lustre/lustre/osc/../../include/linux/libcfs/libcfs.h:36,
                 from ../drivers/staging/lustre/lustre/osc/osc_cl_internal.h:45,
                 from ../drivers/staging/lustre/lustre/osc/osc_cache.c:40:
../drivers/staging/lustre/lustre/osc/osc_cache.c: In function 'osc_dec_unstable_pages':
../include/linux/vmstat.h:247:42: error: comparison between 'enum node_stat_item' and 'enum zone_stat_item' [-Werror=enum-compare]
  dec_zone_page_state_check(page, ((item) == (enum zone_stat_item )0) ? (item) : (item))
                                          ^
../drivers/staging/lustre/lustre/osc/osc_cache.c:1867:3: note: in expansion of macro 'dec_zone_page_state'
   dec_zone_page_state(desc->bd_iov[i].kiov_page, NR_UNSTABLE_NFS);
   ^~~~~~~~~~~~~~~~~~~
../drivers/staging/lustre/lustre/osc/osc_cache.c: In function 'osc_inc_unstable_pages':
../include/linux/vmstat.h:245:42: error: comparison between 'enum node_stat_item' and 'enum zone_stat_item' [-Werror=enum-compare]
  inc_zone_page_state_check(page, ((item) == (enum zone_stat_item )0) ? (item) : (item))
                                          ^
../drivers/staging/lustre/lustre/osc/osc_cache.c:1901:3: note: in expansion of macro 'inc_zone_page_state'
   inc_zone_page_state(desc->bd_iov[i].kiov_page, NR_UNSTABLE_NFS);
   ^~~~~~~~~~~~~~~~~~~

	Arnd