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From: Michal Hocko <mhocko@kernel.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Mike Rapoport <rppt@kernel.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-xfs@vger.kernel.org, dm-devel@redhat.com,
	Mikulas Patocka <mpatocka@redhat.com>,
	Jens Axboe <axboe@kernel.dk>, NeilBrown <neilb@suse.de>
Subject: Re: [PATCH 6/6] mm: Add memalloc_nowait
Date: Mon, 29 Jun 2020 14:52:31 +0200	[thread overview]
Message-ID: <20200629125231.GJ32461@dhcp22.suse.cz> (raw)
In-Reply-To: <20200629121816.GC25523@casper.infradead.org>

On Mon 29-06-20 13:18:16, Matthew Wilcox wrote:
> On Mon, Jun 29, 2020 at 08:08:51AM +0300, Mike Rapoport wrote:
> > > @@ -886,8 +868,12 @@ static struct dm_buffer *__alloc_buffer_wait_no_callback(struct dm_bufio_client
> > >  			return NULL;
> > >  
> > >  		if (dm_bufio_cache_size_latch != 1 && !tried_noio_alloc) {
> > > +			unsigned noio_flag;
> > > +
> > >  			dm_bufio_unlock(c);
> > > -			b = alloc_buffer(c, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
> > > +			noio_flag = memalloc_noio_save();
> > 
> > I've read the series twice and I'm still missing the definition of
> > memalloc_noio_save().
> > 
> > And also it would be nice to have a paragraph about it in
> > Documentation/core-api/memory-allocation.rst
> 
> Documentation/core-api/gfp_mask-from-fs-io.rst:``memalloc_nofs_save``, ``memalloc_nofs_restore`` respectively ``memalloc_noio_save``,
> Documentation/core-api/gfp_mask-from-fs-io.rst:   :functions: memalloc_noio_save memalloc_noio_restore
> Documentation/core-api/gfp_mask-from-fs-io.rst:allows nesting so it is safe to call ``memalloc_noio_save`` or
 
The patch is adding memalloc_nowait* and I suspect Mike had that in
mind, which would be a fair request. Btw. we are missing memalloc_nocma*
documentation either - I was just reminded of its existence today...

-- 
Michal Hocko
SUSE Labs

WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-mm@kvack.org, dm-devel@redhat.com,
	Mikulas Patocka <mpatocka@redhat.com>,
	Mike Rapoport <rppt@kernel.org>
Subject: Re: [PATCH 6/6] mm: Add memalloc_nowait
Date: Mon, 29 Jun 2020 14:52:31 +0200	[thread overview]
Message-ID: <20200629125231.GJ32461@dhcp22.suse.cz> (raw)
In-Reply-To: <20200629121816.GC25523@casper.infradead.org>

On Mon 29-06-20 13:18:16, Matthew Wilcox wrote:
> On Mon, Jun 29, 2020 at 08:08:51AM +0300, Mike Rapoport wrote:
> > > @@ -886,8 +868,12 @@ static struct dm_buffer *__alloc_buffer_wait_no_callback(struct dm_bufio_client
> > >  			return NULL;
> > >  
> > >  		if (dm_bufio_cache_size_latch != 1 && !tried_noio_alloc) {
> > > +			unsigned noio_flag;
> > > +
> > >  			dm_bufio_unlock(c);
> > > -			b = alloc_buffer(c, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
> > > +			noio_flag = memalloc_noio_save();
> > 
> > I've read the series twice and I'm still missing the definition of
> > memalloc_noio_save().
> > 
> > And also it would be nice to have a paragraph about it in
> > Documentation/core-api/memory-allocation.rst
> 
> Documentation/core-api/gfp_mask-from-fs-io.rst:``memalloc_nofs_save``, ``memalloc_nofs_restore`` respectively ``memalloc_noio_save``,
> Documentation/core-api/gfp_mask-from-fs-io.rst:   :functions: memalloc_noio_save memalloc_noio_restore
> Documentation/core-api/gfp_mask-from-fs-io.rst:allows nesting so it is safe to call ``memalloc_noio_save`` or
 
The patch is adding memalloc_nowait* and I suspect Mike had that in
mind, which would be a fair request. Btw. we are missing memalloc_nocma*
documentation either - I was just reminded of its existence today...

-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2020-06-29 19:38 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 11:31 [PATCH 0/6] Overhaul memalloc_no* Matthew Wilcox (Oracle)
2020-06-25 11:31 ` [PATCH 1/6] mm: Replace PF_MEMALLOC_NOIO with memalloc_noio Matthew Wilcox (Oracle)
2020-06-25 12:22   ` Michal Hocko
2020-06-25 12:34     ` Matthew Wilcox
2020-06-25 12:42       ` Michal Hocko
2020-06-25 11:31 ` [PATCH 2/6] mm: Add become_kswapd and restore_kswapd Matthew Wilcox (Oracle)
2020-06-25 12:31   ` Michal Hocko
2020-06-25 11:31 ` [PATCH 3/6] xfs: Convert to memalloc_nofs_save Matthew Wilcox (Oracle)
2020-06-25 11:31 ` [PATCH 4/6] mm: Replace PF_MEMALLOC_NOFS with memalloc_nofs Matthew Wilcox (Oracle)
2020-06-25 13:35   ` Michal Hocko
2020-06-25 11:31 ` [PATCH 5/6] mm: Replace PF_MEMALLOC_NOIO with memalloc_nocma Matthew Wilcox (Oracle)
2020-06-25 11:31 ` [PATCH 6/6] mm: Add memalloc_nowait Matthew Wilcox (Oracle)
2020-06-25 12:40   ` Michal Hocko
2020-06-25 13:10     ` Matthew Wilcox
2020-06-25 13:34       ` Michal Hocko
2020-06-25 19:05   ` kernel test robot
2020-06-25 19:05     ` kernel test robot
2020-06-25 19:05     ` kernel test robot
2020-06-25 23:51   ` kernel test robot
2020-06-25 23:51     ` kernel test robot
2020-06-25 23:51     ` kernel test robot
2020-06-29  5:08   ` Mike Rapoport
2020-06-29  5:08     ` Mike Rapoport
2020-06-29 12:18     ` Matthew Wilcox
2020-06-29 12:18       ` Matthew Wilcox
2020-06-29 12:52       ` Michal Hocko [this message]
2020-06-29 12:52         ` Michal Hocko
2020-06-29 13:45         ` Mike Rapoport
2020-06-29 13:45           ` Mike Rapoport
2020-06-29 13:45           ` Mike Rapoport
2020-06-29 21:28           ` Matthew Wilcox
2020-06-30  6:34             ` Michal Hocko
2020-07-01  4:12               ` Matthew Wilcox
2020-07-01  4:12                 ` Matthew Wilcox
2020-07-01  5:53                 ` Michal Hocko
2020-07-01  7:04                   ` Mike Rapoport
2020-09-24  0:39   ` Mike Snitzer
2020-09-24  1:10     ` Matthew Wilcox
2020-10-23 14:49   ` Daniel Vetter
2020-10-23 14:49     ` [dm-devel] " Daniel Vetter
2020-06-25 18:48 ` [PATCH 0/6] Overhaul memalloc_no* Darrick J. Wong
2020-06-25 20:34   ` Matthew Wilcox
2020-06-25 20:36   ` Michal Hocko
2020-06-25 20:40     ` Matthew Wilcox
2020-06-26 15:02 ` Mikulas Patocka
2020-06-26 15:02   ` Mikulas Patocka
2020-06-26 23:08   ` Dave Chinner
2020-06-27 13:09     ` Mikulas Patocka
2020-06-29  0:35       ` Dave Chinner
2020-06-29 13:43         ` Mikulas Patocka
2020-06-29 13:43           ` Mikulas Patocka
2020-06-29 22:34           ` Dave Chinner
2020-07-03 14:26             ` [PATCH] dm-bufio: do cleanup from a workqueue Mikulas Patocka
2020-06-29  8:22     ` [PATCH 0/6] Overhaul memalloc_no* Michal Hocko
2020-06-29  8:22       ` Michal Hocko

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