Re: [PATCH] memory_hotplug: cond_resched in __remove_pages

2018-11-02 Thread Michal Hocko
On Fri 02-11-18 14:52:05, Balbir Singh wrote: > On Wed, Oct 31, 2018 at 01:58:40PM +0100, Michal Hocko wrote: > > From: Michal Hocko > > > > We have received a bug report that unbinding a large pmem (>1TB) > > can result in a soft lockup: > > [ 380.339203] NMI watchdog: BUG: soft lockup - CPU#9

Re: [PATCH] memory_hotplug: cond_resched in __remove_pages

2018-11-01 Thread Balbir Singh
On Wed, Oct 31, 2018 at 01:58:40PM +0100, Michal Hocko wrote: > From: Michal Hocko > > We have received a bug report that unbinding a large pmem (>1TB) > can result in a soft lockup: > [ 380.339203] NMI watchdog: BUG: soft lockup - CPU#9 stuck for 23s! > [ndctl:4365] > [...] > [ 380.339316] Su

Re: [PATCH] memory_hotplug: cond_resched in __remove_pages

2018-10-31 Thread Michal Hocko
On Wed 31-10-18 12:15:50, Andrew Morton wrote: > On Wed, 31 Oct 2018 13:58:40 +0100 Michal Hocko wrote: > > > From: Michal Hocko > > > > We have received a bug report that unbinding a large pmem (>1TB) > > can result in a soft lockup: > > > > ... > > > > It has been reported on an older (4.12)

Re: [PATCH] memory_hotplug: cond_resched in __remove_pages

2018-10-31 Thread Andrew Morton
On Wed, 31 Oct 2018 13:58:40 +0100 Michal Hocko wrote: > From: Michal Hocko > > We have received a bug report that unbinding a large pmem (>1TB) > can result in a soft lockup: > > ... > > It has been reported on an older (4.12) kernel but the current upstream > code doesn't cond_resched in the

Re: [PATCH] memory_hotplug: cond_resched in __remove_pages

2018-10-31 Thread Johannes Thumshirn
Acked-by: Johannes Thumshirn -- Johannes ThumshirnSUSE Labs jthumsh...@suse.de+49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Key f

[PATCH] memory_hotplug: cond_resched in __remove_pages

2018-10-31 Thread Michal Hocko
From: Michal Hocko We have received a bug report that unbinding a large pmem (>1TB) can result in a soft lockup: [ 380.339203] NMI watchdog: BUG: soft lockup - CPU#9 stuck for 23s! [ndctl:4365] [...] [ 380.339316] Supported: Yes [ 380.339318] CPU: 9 PID: 4365 Comm: ndctl Not tainted 4.12.14-9