From: Jan Kara <jack@suse.cz>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
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>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH 7/9] jbd2: make the whole kjournald2 kthread NOFS safe
Date: Fri, 16 Dec 2016 09:40:57 +0100 [thread overview]
Message-ID: <20161216084057.GE26608@quack2.suse.cz> (raw)
In-Reply-To: <20161215140715.12732-8-mhocko@kernel.org>
On Thu 15-12-16 15:07:13, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
>
> kjournald2 is central to the transaction commit processing. As such any
> potential allocation from this kernel thread has to be GFP_NOFS. Make
> sure to mark the whole kernel thread GFP_NOFS by the memalloc_nofs_save.
>
> Suggested-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Michal Hocko <mhocko@suse.com>
Looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> fs/jbd2/journal.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 8ed971eeab44..6dad8c5d6ddf 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -206,6 +206,13 @@ static int kjournald2(void *arg)
> wake_up(&journal->j_wait_done_commit);
>
> /*
> + * Make sure that no allocations from this kernel thread will ever recurse
> + * to the fs layer because we are responsible for the transaction commit
> + * and any fs involvement might get stuck waiting for the trasn. commit.
> + */
> + memalloc_nofs_save();
> +
> + /*
> * And now, wait forever for commit wakeup events.
> */
> write_lock(&journal->j_state_lock);
> --
> 2.10.2
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack@suse.cz>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
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>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH 7/9] jbd2: make the whole kjournald2 kthread NOFS safe
Date: Fri, 16 Dec 2016 09:40:57 +0100 [thread overview]
Message-ID: <20161216084057.GE26608@quack2.suse.cz> (raw)
In-Reply-To: <20161215140715.12732-8-mhocko@kernel.org>
On Thu 15-12-16 15:07:13, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
>
> kjournald2 is central to the transaction commit processing. As such any
> potential allocation from this kernel thread has to be GFP_NOFS. Make
> sure to mark the whole kernel thread GFP_NOFS by the memalloc_nofs_save.
>
> Suggested-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Michal Hocko <mhocko@suse.com>
Looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> fs/jbd2/journal.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 8ed971eeab44..6dad8c5d6ddf 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -206,6 +206,13 @@ static int kjournald2(void *arg)
> wake_up(&journal->j_wait_done_commit);
>
> /*
> + * Make sure that no allocations from this kernel thread will ever recurse
> + * to the fs layer because we are responsible for the transaction commit
> + * and any fs involvement might get stuck waiting for the trasn. commit.
> + */
> + memalloc_nofs_save();
> +
> + /*
> * And now, wait forever for commit wakeup events.
> */
> write_lock(&journal->j_state_lock);
> --
> 2.10.2
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
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WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack@suse.cz>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] [PATCH 7/9] jbd2: make the whole kjournald2 kthread NOFS safe
Date: Fri, 16 Dec 2016 09:40:57 +0100 [thread overview]
Message-ID: <20161216084057.GE26608@quack2.suse.cz> (raw)
In-Reply-To: <20161215140715.12732-8-mhocko@kernel.org>
On Thu 15-12-16 15:07:13, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
>
> kjournald2 is central to the transaction commit processing. As such any
> potential allocation from this kernel thread has to be GFP_NOFS. Make
> sure to mark the whole kernel thread GFP_NOFS by the memalloc_nofs_save.
>
> Suggested-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Michal Hocko <mhocko@suse.com>
Looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> fs/jbd2/journal.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 8ed971eeab44..6dad8c5d6ddf 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -206,6 +206,13 @@ static int kjournald2(void *arg)
> wake_up(&journal->j_wait_done_commit);
>
> /*
> + * Make sure that no allocations from this kernel thread will ever recurse
> + * to the fs layer because we are responsible for the transaction commit
> + * and any fs involvement might get stuck waiting for the trasn. commit.
> + */
> + memalloc_nofs_save();
> +
> + /*
> * And now, wait forever for commit wakeup events.
> */
> write_lock(&journal->j_state_lock);
> --
> 2.10.2
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2016-12-19 9:36 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-15 14:07 [PATCH 0/9 v2] scope GFP_NOFS api Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` [PATCH 1/9] lockdep: allow to disable reclaim lockup detection Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` [PATCH 2/9] xfs: introduce and use KM_NOLOCKDEP to silence reclaim lockdep false positives Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-16 15:40 ` [PATCH 2/9 v2] " Michal Hocko
2016-12-16 15:40 ` [Cluster-devel] " Michal Hocko
2016-12-16 15:40 ` Michal Hocko
2016-12-16 15:40 ` Michal Hocko
2016-12-16 15:40 ` Michal Hocko
2016-12-16 16:37 ` Brian Foster
2016-12-16 16:37 ` [Cluster-devel] " Brian Foster
2016-12-16 16:37 ` Brian Foster
2016-12-16 22:01 ` Michal Hocko
2016-12-16 22:01 ` [Cluster-devel] " Michal Hocko
2016-12-16 22:01 ` Michal Hocko
2016-12-19 21:24 ` [PATCH 2/9] " Dave Chinner
2016-12-19 21:24 ` [Cluster-devel] " Dave Chinner
2016-12-19 21:24 ` Dave Chinner
2016-12-19 22:06 ` Darrick J. Wong
2016-12-19 22:07 ` [Cluster-devel] " Darrick J. Wong
2016-12-19 22:06 ` Darrick J. Wong
2016-12-20 21:39 ` Dave Chinner
2016-12-20 21:39 ` [Cluster-devel] " Dave Chinner
2016-12-20 21:39 ` Dave Chinner
2016-12-20 8:38 ` Michal Hocko
2016-12-20 8:38 ` [Cluster-devel] " Michal Hocko
2016-12-20 8:38 ` Michal Hocko
2016-12-15 14:07 ` [PATCH 3/9] xfs: abstract PF_FSTRANS to PF_MEMALLOC_NOFS Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-16 16:38 ` Brian Foster
2016-12-16 16:38 ` [Cluster-devel] " Brian Foster
2016-12-16 16:38 ` Brian Foster
2016-12-15 14:07 ` [PATCH 4/9] mm: introduce memalloc_nofs_{save,restore} API Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] [PATCH 4/9] mm: introduce memalloc_nofs_{save, restore} API Michal Hocko
2016-12-15 14:07 ` [PATCH 4/9] mm: introduce memalloc_nofs_{save,restore} API Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-17 10:44 ` Tetsuo Handa
2016-12-18 16:21 ` Michal Hocko
2016-12-15 14:07 ` [PATCH 5/9] xfs: use memalloc_nofs_{save,restore} instead of memalloc_noio* Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] [PATCH 5/9] xfs: use memalloc_nofs_{save, restore} " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` [PATCH 5/9] xfs: use memalloc_nofs_{save,restore} " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-16 16:38 ` Brian Foster
2016-12-16 16:38 ` [Cluster-devel] [PATCH 5/9] xfs: use memalloc_nofs_{save, restore} " Brian Foster
2016-12-16 16:38 ` [PATCH 5/9] xfs: use memalloc_nofs_{save,restore} " Brian Foster
2016-12-16 22:00 ` [PATCH 5/9 v2] " Michal Hocko
2016-12-16 22:00 ` [Cluster-devel] [PATCH 5/9 v2] xfs: use memalloc_nofs_{save, restore} " Michal Hocko
2016-12-16 22:00 ` [PATCH 5/9 v2] xfs: use memalloc_nofs_{save,restore} " Michal Hocko
2016-12-16 22:00 ` Michal Hocko
2016-12-16 22:00 ` Michal Hocko
2016-12-15 14:07 ` [PATCH 6/9] jbd2: mark the transaction context with the scope GFP_NOFS context Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-16 8:39 ` Jan Kara
2016-12-16 8:39 ` [Cluster-devel] " Jan Kara
2016-12-16 8:39 ` Jan Kara
2016-12-15 14:07 ` [PATCH 7/9] jbd2: make the whole kjournald2 kthread NOFS safe Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-16 8:40 ` Jan Kara [this message]
2016-12-16 8:40 ` [Cluster-devel] " Jan Kara
2016-12-16 8:40 ` Jan Kara
2016-12-15 14:07 ` [PATCH 8/9] Revert "ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp" Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-16 8:41 ` Jan Kara
2016-12-16 8:41 ` [Cluster-devel] " Jan Kara
2016-12-16 8:41 ` Jan Kara
2016-12-15 14:07 ` [PATCH 9/9] Revert "ext4: fix wrong gfp type under transaction" Michal Hocko
2016-12-15 14:07 ` [Cluster-devel] " Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-15 14:07 ` Michal Hocko
2016-12-16 8:43 ` Jan Kara
2016-12-16 8:43 ` [Cluster-devel] " Jan Kara
2016-12-16 8:43 ` Jan Kara
2016-12-16 12:46 ` [DEBUG PATCH 0/2] debug explicit GFP_NO{FS,IO} usage from the scope context Michal Hocko
2016-12-16 12:46 ` [Cluster-devel] [DEBUG PATCH 0/2] debug explicit GFP_NO{FS, IO} " Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` [DEBUG PATCH 0/2] debug explicit GFP_NO{FS,IO} " Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` [DEBUG PATCH 1/2] mm, debug: report when GFP_NO{FS,IO} is used explicitly from memalloc_no{fs,io}_{save,restore} context Michal Hocko
2016-12-16 12:46 ` [Cluster-devel] [DEBUG PATCH 1/2] mm, debug: report when GFP_NO{FS, IO} is used explicitly from memalloc_no{fs, io}_{save, restore} context Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` [DEBUG PATCH 1/2] mm, debug: report when GFP_NO{FS,IO} is used explicitly from memalloc_no{fs,io}_{save,restore} context Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` [DEBUG PATCH 2/2] silent warnings which we cannot do anything about Michal Hocko
2016-12-16 12:46 ` [Cluster-devel] " Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 12:46 ` Michal Hocko
2016-12-16 15:05 ` [PATCH 0/9 v2] scope GFP_NOFS api Mike Galbraith
2016-12-16 15:06 ` [Cluster-devel] " Mike Galbraith
2016-12-16 15:05 ` Mike Galbraith
2016-12-16 15:05 ` Mike Galbraith
2016-12-16 15:05 ` Mike Galbraith
2016-12-16 15:05 ` Mike Galbraith
2016-12-16 15:05 ` Mike Galbraith
2016-12-16 15:35 ` Michal Hocko
2016-12-16 15:35 ` [Cluster-devel] " Michal Hocko
2016-12-16 15:35 ` Michal Hocko
2016-12-16 16:27 ` Mike Galbraith
2016-12-16 16:27 ` [Cluster-devel] " Mike Galbraith
2016-12-16 16:27 ` Mike Galbraith
2016-12-16 16:27 ` Mike Galbraith
2016-12-16 16:27 ` Mike Galbraith
2016-12-19 9:25 ` Jan Kara
2016-12-19 9:25 ` [Cluster-devel] " Jan Kara
2016-12-19 9:25 ` Jan Kara
2016-12-22 9:38 ` Michal Hocko
2016-12-22 9:38 ` [Cluster-devel] " Michal Hocko
2016-12-22 9:38 ` Michal Hocko
2016-12-22 9:38 ` Michal Hocko
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