From: Cyril Hrubis <chrubis@suse.cz>
To: kernel test robot <oliver.sang@intel.com>
Cc: syzbot+b591856e0f0139f83023@syzkaller.appspotmail.com,
lkp@intel.com, syzkaller-bugs@googlegroups.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
oe-lkp@lists.linux.dev, akpm@linux-foundation.org,
ltp@lists.linux.it, Edward AD <eadavis@sina.com>
Subject: Re: [LTP] [PATCH] mm: as the same logic with queue_pages_range
Date: Wed, 13 Sep 2023 11:10:10 +0200 [thread overview]
Message-ID: <ZQF8cn4k1qqdYj8x@yuki> (raw)
In-Reply-To: <202309121302.8864096c-oliver.sang@intel.com>
Hi!
> Running tests.......
> <<<test_start>>>
> tag=vma02 stime=1694438526
> cmdline="vma02"
> contacts=""
> analysis=exit
> <<<test_output>>>
> vma02 0 TINFO : pid = 3639 addr = 0x7f5202dd6000
> vma02 0 TINFO : start = 0x7f5202dd6000, end = 0x7f5202dd7000
> vma02 0 TINFO : start = 0x7f5202dd7000, end = 0x7f5202dd8000
> vma02 0 TINFO : start = 0x7f5202dd8000, end = 0x7f5202dd9000
> vma02 1 TFAIL : vma02.c:144: >1 unmerged VMAs.
> incrementing stop
So the test is reproducer for:
commit 9d8cebd4bcd7c3878462fdfda34bbcdeb4df7ef4
Author: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Date: Fri Mar 5 13:41:57 2010 -0800
mm: fix mbind vma merge problem
Strangely, current mbind() doesn't merge vma with neighbor vma although it's possible.
Unfortunately, many vma can reduce performance...
And what the test does is:
- map 3 continous pages
- popluate
- mbind() first page
- mbind() all three pages
- checks that there is only single VMA for the pages after second
mbind()
--
Cyril Hrubis
chrubis@suse.cz
--
Mailing list info: https://lists.linux.it/listinfo/ltp
next prev parent reply other threads:[~2023-09-13 9:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230906061902.591996-1-eadavis@sina.com>
2023-09-12 5:20 ` [LTP] [PATCH] mm: as the same logic with queue_pages_range kernel test robot
2023-09-13 9:10 ` Cyril Hrubis [this message]
2023-09-14 5:53 ` [LTP] [PATCH] mm: extpand queue_pages_range() to find and lock the vma range Edward AD
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