From: Jan Kara <jack@suse.cz>
To: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Jan Kara <jack@suse.cz>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-nvdimm@lists.01.org,
Dan Williams <dan.j.williams@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH 18/20] dax: Make cache flushing protected by entry lock
Date: Wed, 19 Oct 2016 09:19:06 +0200 [thread overview]
Message-ID: <20161019071906.GH29967@quack2.suse.cz> (raw)
In-Reply-To: <20161018192013.GE7796@linux.intel.com>
On Tue 18-10-16 13:20:13, Ross Zwisler wrote:
> On Tue, Sep 27, 2016 at 06:08:22PM +0200, Jan Kara wrote:
> > Currently, flushing of caches for DAX mappings was ignoring entry lock.
> > So far this was ok (modulo a bug that a difference in entry lock could
> > cause cache flushing to be mistakenly skipped) but in the following
> > patches we will write-protect PTEs on cache flushing and clear dirty
> > tags. For that we will need more exclusion. So do cache flushing under
> > an entry lock. This allows us to remove one lock-unlock pair of
> > mapping->tree_lock as a bonus.
> >
> > Signed-off-by: Jan Kara <jack@suse.cz>
>
> > @@ -716,15 +736,13 @@ static int dax_writeback_one(struct block_device *bdev,
> > }
> >
> > wb_cache_pmem(dax.addr, dax.size);
> > -
> > - spin_lock_irq(&mapping->tree_lock);
> > - radix_tree_tag_clear(page_tree, index, PAGECACHE_TAG_TOWRITE);
> > - spin_unlock_irq(&mapping->tree_lock);
> > - unmap:
> > +unmap:
> > dax_unmap_atomic(bdev, &dax);
> > + put_locked_mapping_entry(mapping, index, entry);
> > return ret;
> >
> > - unlock:
> > +put_unlock:
>
> I know there's an ongoing debate about this, but can you please stick a space
> in front of the labels to make the patches pretty & to be consistent with the
> rest of the DAX code?
OK, done.
> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Thanks!
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
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next prev parent reply other threads:[~2016-10-19 7:19 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-27 16:08 [PATCH 0/20 v3] dax: Clear dirty bits after flushing caches Jan Kara
2016-09-27 16:08 ` [PATCH 01/20] mm: Change type of vmf->virtual_address Jan Kara
2016-09-30 9:07 ` Christoph Hellwig
2016-10-14 18:02 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 02/20] mm: Join struct fault_env and vm_fault Jan Kara
2016-09-30 9:10 ` Christoph Hellwig
2016-10-03 7:43 ` Jan Kara
2016-09-27 16:08 ` [PATCH 03/20] mm: Use pgoff in struct vm_fault instead of passing it separately Jan Kara
2016-10-14 18:42 ` Ross Zwisler
2016-10-17 9:01 ` Jan Kara
2016-09-27 16:08 ` [PATCH 04/20] mm: Use passed vm_fault structure in __do_fault() Jan Kara
2016-10-14 19:05 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 05/20] mm: Trim __do_fault() arguments Jan Kara
2016-10-14 20:31 ` Ross Zwisler
2016-10-17 9:04 ` Jan Kara
2016-09-27 16:08 ` [PATCH 06/20] mm: Use pass vm_fault structure for in wp_pfn_shared() Jan Kara
2016-10-14 21:04 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 07/20] mm: Add orig_pte field into vm_fault Jan Kara
2016-10-17 16:45 ` Ross Zwisler
2016-10-18 10:13 ` Jan Kara
2016-09-27 16:08 ` [PATCH 08/20] mm: Allow full handling of COW faults in ->fault handlers Jan Kara
2016-10-17 16:50 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 09/20] mm: Factor out functionality to finish page faults Jan Kara
2016-10-17 17:38 ` Ross Zwisler
2016-10-17 17:40 ` Ross Zwisler
2016-10-18 9:44 ` Jan Kara
2016-09-27 16:08 ` [PATCH 10/20] mm: Move handling of COW faults into DAX code Jan Kara
2016-10-17 19:29 ` Ross Zwisler
2016-10-18 10:32 ` Jan Kara
2016-09-27 16:08 ` [PATCH 11/20] mm: Remove unnecessary vma->vm_ops check Jan Kara
2016-10-17 19:40 ` Ross Zwisler
2016-10-18 10:37 ` Jan Kara
2016-09-27 16:08 ` [PATCH 12/20] mm: Factor out common parts of write fault handling Jan Kara
2016-10-17 22:08 ` Ross Zwisler
2016-10-18 10:50 ` Jan Kara
2016-10-18 17:32 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 13/20] mm: Pass vm_fault structure into do_page_mkwrite() Jan Kara
2016-10-17 22:29 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 14/20] mm: Use vmf->page during WP faults Jan Kara
2016-10-18 17:56 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 15/20] mm: Move part of wp_page_reuse() into the single call site Jan Kara
2016-10-18 17:59 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 16/20] mm: Provide helper for finishing mkwrite faults Jan Kara
2016-10-18 18:35 ` Ross Zwisler
2016-10-19 7:16 ` Jan Kara
2016-10-19 17:21 ` Ross Zwisler
2016-10-20 8:48 ` Jan Kara
2016-09-27 16:08 ` [PATCH 17/20] mm: Export follow_pte() Jan Kara
2016-10-18 18:37 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 18/20] dax: Make cache flushing protected by entry lock Jan Kara
2016-10-18 19:20 ` Ross Zwisler
2016-10-19 7:19 ` Jan Kara [this message]
2016-10-19 18:25 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 19/20] dax: Protect PTE modification on WP fault by radix tree " Jan Kara
2016-10-18 19:53 ` Ross Zwisler
2016-10-19 7:25 ` Jan Kara
2016-10-19 17:25 ` Ross Zwisler
2016-09-27 16:08 ` [PATCH 20/20] dax: Clear dirty entry tags on cache flush Jan Kara
2016-10-18 22:12 ` Ross Zwisler
2016-10-19 7:30 ` Jan Kara
2016-10-19 16:38 ` Ross Zwisler
2016-09-30 9:14 ` [PATCH 0/20 v3] dax: Clear dirty bits after flushing caches Christoph Hellwig
2016-10-03 7:59 ` Jan Kara
2016-10-03 8:03 ` Christoph Hellwig
2016-10-03 8:15 ` Jan Kara
2016-10-03 9:32 ` Christoph Hellwig
2016-10-03 11:13 ` Jan Kara
2016-10-13 20:34 ` Ross Zwisler
2016-10-17 8:47 ` Jan Kara
2016-10-17 18:59 ` Ross Zwisler
2016-10-18 9:49 ` Jan Kara
2016-11-01 22:36 [PATCH 0/21 v4] " Jan Kara
2016-11-01 22:36 ` [PATCH 18/20] dax: Make cache flushing protected by entry lock Jan Kara
2016-11-18 9:17 [PATCH 0/20 v5] dax: Clear dirty bits after flushing caches Jan Kara
2016-11-18 9:17 ` [PATCH 18/20] dax: Make cache flushing protected by entry lock Jan Kara
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