Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-06 Thread Andi Kleen
> > What's the point of this indirection other than another way of avoiding > > empty node 0? > > Honestly, I do not have any idea. I've traced it down to > Author: Andi Kleen > Date: Tue Jan 11 15:35:48 2005 -0800 I don't remember all the details, and I can't even find the commit (is it in

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-03 Thread Srikar Dronamraju
* Michal Hocko [2020-07-03 12:59:44]: > > Honestly, I do not have any idea. I've traced it down to > > Author: Andi Kleen > > Date: Tue Jan 11 15:35:48 2005 -0800 > > > > [PATCH] x86_64: Fix ACPI SRAT NUMA parsing > > > > Fix fallout from the recent nodemask_t changes. The node ids

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-03 Thread Michal Hocko
On Fri 03-07-20 13:32:21, David Hildenbrand wrote: > On 03.07.20 12:59, Michal Hocko wrote: > > On Fri 03-07-20 11:24:17, Michal Hocko wrote: > >> [Cc Andi] > >> > >> On Fri 03-07-20 11:10:01, Michal Suchanek wrote: > >>> On Wed, Jul 01, 2020 at 02:21:10PM +0200, Michal Hocko wrote: > On Wed

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-03 Thread David Hildenbrand
On 03.07.20 12:59, Michal Hocko wrote: > On Fri 03-07-20 11:24:17, Michal Hocko wrote: >> [Cc Andi] >> >> On Fri 03-07-20 11:10:01, Michal Suchanek wrote: >>> On Wed, Jul 01, 2020 at 02:21:10PM +0200, Michal Hocko wrote: On Wed 01-07-20 13:30:57, David Hildenbrand wrote: >> [...] > Yep,

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-03 Thread Michal Hocko
On Fri 03-07-20 11:24:17, Michal Hocko wrote: > [Cc Andi] > > On Fri 03-07-20 11:10:01, Michal Suchanek wrote: > > On Wed, Jul 01, 2020 at 02:21:10PM +0200, Michal Hocko wrote: > > > On Wed 01-07-20 13:30:57, David Hildenbrand wrote: > [...] > > > > Yep, looks like it. > > > > > > > > [

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-03 Thread Michal Hocko
[Cc Andi] On Fri 03-07-20 11:10:01, Michal Suchanek wrote: > On Wed, Jul 01, 2020 at 02:21:10PM +0200, Michal Hocko wrote: > > On Wed 01-07-20 13:30:57, David Hildenbrand wrote: [...] > > > Yep, looks like it. > > > > > > [0.009726] SRAT: PXM 1 -> APIC 0x00 -> Node 0 > > > [0.009727]

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-03 Thread Michal Suchánek
On Wed, Jul 01, 2020 at 02:21:10PM +0200, Michal Hocko wrote: > On Wed 01-07-20 13:30:57, David Hildenbrand wrote: > > On 01.07.20 13:06, David Hildenbrand wrote: > > > On 01.07.20 13:01, Srikar Dronamraju wrote: > > >> * David Hildenbrand [2020-07-01 12:15:54]: > > >> > > >>> On 01.07.20 12:04,

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-02 Thread Srikar Dronamraju
* Michal Hocko [2020-07-02 10:41:23]: > On Thu 02-07-20 12:14:08, Srikar Dronamraju wrote: > > * Michal Hocko [2020-07-01 14:21:10]: > > > > > > > The autonuma problem sounds interesting but again this patch > > > > > doesn't > > > > > really solve the underlying problem because I

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-02 Thread Michal Hocko
On Thu 02-07-20 12:14:08, Srikar Dronamraju wrote: > * Michal Hocko [2020-07-01 14:21:10]: > > > > >> > > > >> 2. Also existence of dummy node also leads to inconsistent > > > >> information. The > > > >> number of online nodes is inconsistent with the information in the > > >

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-02 Thread Srikar Dronamraju
* Michal Hocko [2020-07-01 14:21:10]: > > >> > > >> 2. Also existence of dummy node also leads to inconsistent > > >> information. The > > >> number of online nodes is inconsistent with the information in the > > >> device-tree and resource-dump > > >> > > >> 3. When

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread Michal Hocko
On Tue 30-06-20 09:31:25, Srikar Dronamraju wrote: > * Christopher Lameter [2020-06-29 14:58:40]: > > > On Wed, 24 Jun 2020, Srikar Dronamraju wrote: > > > > > Currently Linux kernel with CONFIG_NUMA on a system with multiple > > > possible nodes, marks node 0 as online at boot. However in

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread Michal Hocko
On Wed 01-07-20 13:30:57, David Hildenbrand wrote: > On 01.07.20 13:06, David Hildenbrand wrote: > > On 01.07.20 13:01, Srikar Dronamraju wrote: > >> * David Hildenbrand [2020-07-01 12:15:54]: > >> > >>> On 01.07.20 12:04, Srikar Dronamraju wrote: > * Michal Hocko [2020-07-01 10:42:00]: >

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread David Hildenbrand
On 01.07.20 13:06, David Hildenbrand wrote: > On 01.07.20 13:01, Srikar Dronamraju wrote: >> * David Hildenbrand [2020-07-01 12:15:54]: >> >>> On 01.07.20 12:04, Srikar Dronamraju wrote: * Michal Hocko [2020-07-01 10:42:00]: > >> >> 2. Also existence of dummy node also

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread David Hildenbrand
On 01.07.20 13:01, Srikar Dronamraju wrote: > * David Hildenbrand [2020-07-01 12:15:54]: > >> On 01.07.20 12:04, Srikar Dronamraju wrote: >>> * Michal Hocko [2020-07-01 10:42:00]: >>> > > 2. Also existence of dummy node also leads to inconsistent information. > The >

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread Srikar Dronamraju
* David Hildenbrand [2020-07-01 12:15:54]: > On 01.07.20 12:04, Srikar Dronamraju wrote: > > * Michal Hocko [2020-07-01 10:42:00]: > > > >> > >>> > >>> 2. Also existence of dummy node also leads to inconsistent information. > >>> The > >>> number of online nodes is inconsistent with the

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread David Hildenbrand
On 01.07.20 12:04, Srikar Dronamraju wrote: > * Michal Hocko [2020-07-01 10:42:00]: > >> >>> >>> 2. Also existence of dummy node also leads to inconsistent information. The >>> number of online nodes is inconsistent with the information in the >>> device-tree and resource-dump >>> >>> 3. When

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread Srikar Dronamraju
* Michal Hocko [2020-07-01 10:42:00]: > > > > > 2. Also existence of dummy node also leads to inconsistent information. The > > number of online nodes is inconsistent with the information in the > > device-tree and resource-dump > > > > 3. When the dummy node is present, single node non-Numa

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-07-01 Thread Michal Hocko
On Wed 24-06-20 14:58:46, Srikar Dronamraju wrote: > Currently Linux kernel with CONFIG_NUMA on a system with multiple > possible nodes, marks node 0 as online at boot. However in practice, > there are systems which have node 0 as memoryless and cpuless. > > This can cause numa_balancing to be

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-06-29 Thread Srikar Dronamraju
* Christopher Lameter [2020-06-29 14:58:40]: > On Wed, 24 Jun 2020, Srikar Dronamraju wrote: > > > Currently Linux kernel with CONFIG_NUMA on a system with multiple > > possible nodes, marks node 0 as online at boot. However in practice, > > there are systems which have node 0 as memoryless

Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

2020-06-29 Thread Christopher Lameter
On Wed, 24 Jun 2020, Srikar Dronamraju wrote: > Currently Linux kernel with CONFIG_NUMA on a system with multiple > possible nodes, marks node 0 as online at boot. However in practice, > there are systems which have node 0 as memoryless and cpuless. Maybe add something to explain why you are