From: Matthew Wilcox <willy@infradead.org>
To: kernel test robot <oliver.sang@intel.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>,
oe-lkp@lists.linux.dev, lkp@intel.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
maple-tree@lists.infradead.org,
Suren Baghdasaryan <surenb@google.com>,
stable@vger.kernel.org,
syzbot+8d95422d3537159ca390@syzkaller.appspotmail.com
Subject: Re: [PATCH 8/8] mm: enable maple tree RCU mode by default.
Date: Tue, 11 Apr 2023 03:25:12 +0100 [thread overview]
Message-ID: <ZDTFCOg7/I1WIviR@casper.infradead.org> (raw)
In-Reply-To: <202304110907.a7339b10-oliver.sang@intel.com>
On Tue, Apr 11, 2023 at 09:25:16AM +0800, kernel test robot wrote:
> kernel test robot noticed a -8.5% regression of stress-ng.mmapaddr.ops_per_sec on:
Assuming this is the test in question:
https://github.com/ColinIanKing/stress-ng/blob/master/stress-mmapaddr.c
then yes, this is expected. The test calls mmap() and munmap() a lot,
and we've made those slower in order to fix a bug.
While it does take pagefaults (which is a better test than some
microbenchmarks), it only takes one pagefault per call to mmap() and
munmap(), which is not representative of real workloads.
Thanks for running the test.
next prev parent reply other threads:[~2023-04-11 2:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-27 18:55 [PATCH 0/8] Fix VMA tree modification under mmap read lock Liam R. Howlett
2023-03-27 18:55 ` [PATCH 1/8] maple_tree: be more cautious about dead nodes Liam R. Howlett
2023-03-27 18:55 ` [PATCH 2/8] maple_tree: detect dead nodes in mas_start() Liam R. Howlett
2023-03-27 18:55 ` [PATCH 3/8] maple_tree: fix freeing of nodes in rcu mode Liam R. Howlett
2023-03-27 18:55 ` [PATCH 4/8] maple_tree: remove extra smp_wmb() from mas_dead_leaves() Liam R. Howlett
2023-03-27 18:55 ` [PATCH 5/8] maple_tree: fix write memory barrier of nodes once dead for RCU mode Liam R. Howlett
2023-03-27 19:05 ` Liam R. Howlett
2023-03-27 19:45 ` Andrew Morton
2023-03-27 18:55 ` [PATCH 6/8] maple_tree: add smp_rmb() to dead node detection Liam R. Howlett
2023-03-27 18:55 ` [PATCH 7/8] maple_tree: add RCU lock checking to rcu callback functions Liam R. Howlett
2023-03-27 18:55 ` [PATCH 8/8] mm: enable maple tree RCU mode by default Liam R. Howlett
2023-03-27 19:38 ` Andrew Morton
2023-03-27 19:43 ` Liam R. Howlett
2023-04-11 1:25 ` kernel test robot
2023-04-11 2:25 ` Matthew Wilcox [this message]
2023-03-27 19:35 ` [PATCH 0/8] Fix VMA tree modification under mmap read lock Andrew Morton
2023-03-27 19:48 ` Liam R. Howlett
2023-03-28 9:10 ` Vlastimil Babka
2023-03-28 13:02 ` Liam R. Howlett
2023-04-03 19:44 ` Liam R. Howlett
2023-04-03 20:19 ` Andrew Morton
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