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From: Vlastimil Babka <vbabka@suse.cz>
To: Nikolay Borisov <kernel@kyup.com>, Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
	Linux MM <linux-mm@kvack.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: Softlockup during memory allocation
Date: Wed, 2 Nov 2016 20:00:31 +0100	[thread overview]
Message-ID: <89ee3413-71a3-403d-48fa-af325d40f8db@suse.cz> (raw)
In-Reply-To: <e3177ea6-a921-dac9-f4f3-952c14e2c4df@kyup.com>

On 11/01/2016 09:12 AM, Nikolay Borisov wrote:
> In addition to that I believe there is something wrong
> with the NR_PAGES_SCANNED stats since they are being negative. 
> I haven't looked into the code to see how this value is being 
> synchronized and if there is a possibility of it temporary going negative. 

This is because there's a shared counter and percpu diffs, and crash
only looks at the shared counter.

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  parent reply	other threads:[~2016-11-02 19:00 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-01  8:12 Softlockup during memory allocation Nikolay Borisov
2016-11-01  8:16 ` Nikolay Borisov
2016-11-02 19:00 ` Vlastimil Babka [this message]
2016-11-04  3:46   ` Hugh Dickins
2016-11-04 12:18 ` Nikolay Borisov
2016-11-13 22:02   ` Nikolay Borisov
2016-11-21  5:31     ` Michal Hocko
2016-11-22  8:56       ` Nikolay Borisov
2016-11-22 14:30         ` Michal Hocko
2016-11-22 14:32           ` Michal Hocko
2016-11-22 14:46             ` Nikolay Borisov
2016-11-22 14:35           ` Nikolay Borisov
2016-11-22 17:02             ` Michal Hocko
2016-11-23  7:44               ` Nikolay Borisov
2016-11-23  7:49                 ` Michal Hocko
2016-11-23  7:50                   ` Michal Hocko
2016-11-24 11:45                   ` Nikolay Borisov
2016-11-24 12:12                     ` Michal Hocko
2016-11-24 13:09                       ` Nikolay Borisov
2016-11-25  9:00                         ` Michal Hocko

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