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From: Mel Gorman <mgorman@suse.de>
To: Jan Kara <jack@suse.cz>
Cc: linux-mm@kvack.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 7/7] mm: Batch radix tree operations when truncating pages
Date: Wed, 11 Oct 2017 08:39:59 +0100	[thread overview]
Message-ID: <20171011073959.tvajcejxho7g7zw2@suse.de> (raw)
In-Reply-To: <20171010151937.26984-8-jack@suse.cz>

On Tue, Oct 10, 2017 at 05:19:37PM +0200, Jan Kara wrote:
> Currently we remove pages from the radix tree one by one. To speed up
> page cache truncation, lock several pages at once and free them in one
> go. This allows us to batch radix tree operations in a more efficient
> way and also save round-trips on mapping->tree_lock. As a result we gain
> about 20% speed improvement in page cache truncation.
> 
> Data from a simple benchmark timing 10000 truncates of 1024 pages (on
> ext4 on ramdisk but the filesystem is barely visible in the profiles).
> The range shows 1% and 95% percentiles of the measured times:
> 
> 4.14-rc2	4.14-rc2 + batched truncation
> 248-256		209-219
> 249-258		209-217
> 248-255		211-239
> 248-255		209-217
> 247-256		210-218
> 
> Signed-off-by: Jan Kara <jack@suse.cz>

Acked-by: Mel Gorman <mgorman@suse.de>

-- 
Mel Gorman
SUSE Labs

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  reply	other threads:[~2017-10-11  7:39 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-10 15:19 [PATCH 0/7 v1] Speed up page cache truncation Jan Kara
2017-10-10 15:19 ` Jan Kara
2017-10-10 15:19 ` [PATCH 1/7] mm: Speedup cancel_dirty_page() for clean pages Jan Kara
2017-10-10 15:19   ` Jan Kara
2017-10-10 15:19 ` [PATCH 2/7] mm: Refactor truncate_complete_page() Jan Kara
2017-10-10 15:19   ` Jan Kara
2017-10-10 15:19 ` [PATCH 3/7] mm: Factor out page cache page freeing into a separate function Jan Kara
2017-10-10 15:19   ` Jan Kara
2017-10-10 15:19 ` [PATCH 4/7] mm: Move accounting updates before page_cache_tree_delete() Jan Kara
2017-10-10 15:19   ` Jan Kara
2017-10-10 15:19 ` [PATCH 5/7] mm: Move clearing of page->mapping to page_cache_tree_delete() Jan Kara
2017-10-10 15:19   ` Jan Kara
2017-10-10 15:19 ` [PATCH 6/7] mm: Factor out checks and accounting from __delete_from_page_cache() Jan Kara
2017-10-10 15:19   ` Jan Kara
2017-10-10 15:19 ` [PATCH 7/7] mm: Batch radix tree operations when truncating pages Jan Kara
2017-10-10 15:19   ` Jan Kara
2017-10-11  7:39   ` Mel Gorman [this message]
2017-10-17 23:05   ` Andrew Morton
2017-10-17 23:05     ` Andrew Morton
2017-10-18 10:44     ` Jan Kara
2017-10-10 17:25 ` [PATCH 0/7 v1] Speed up page cache truncation Andi Kleen
2017-10-10 17:25   ` Andi Kleen
2017-10-11  8:06   ` Jan Kara
2017-10-11 16:51     ` Andi Kleen
2017-10-11 17:34     ` Dave Hansen
2017-10-11 17:59       ` Mel Gorman
2017-10-11 18:37         ` Andi Kleen
2017-10-11 21:06       ` Jan Kara
2017-10-11 21:24         ` Dave Chinner
2017-10-12  9:09           ` Mel Gorman
2017-10-12 14:07           ` Jan Kara
2017-10-17 16:21 [PATCH 0/7 v2] " Jan Kara
2017-10-17 16:21 ` [PATCH 7/7] mm: Batch radix tree operations when truncating pages Jan Kara
2017-10-17 16:21   ` Jan Kara

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