From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: David Rientjes <rientjes@google.com>,
Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org
Subject: Re: [PATCH V4] mm: Add sysfs interface to dump each node's zonelist information
Date: Thu, 13 Oct 2016 20:08:03 +0530 [thread overview]
Message-ID: <57FF9C4B.5040004@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.10.1609191752080.53329@chino.kir.corp.google.com>
On 09/20/2016 06:24 AM, David Rientjes wrote:
> On Sat, 17 Sep 2016, Anshuman Khandual wrote:
>
>>> > > I'm questioning if this information can be inferred from information
>>> > > already in /proc/zoneinfo and sysfs. We know the no-fallback zonelist is
>>> > > going to include the local node, and we know the other zonelists are
>>> > > either node ordered or zone ordered (or do we need to extend
>>> > > vm.numa_zonelist_order for default?). I may have missed what new
>>> > > knowledge this interface is imparting on us.
>> >
>> > IIUC /proc/zoneinfo lists down zone internal state and statistics for
>> > all zones on the system at any given point of time. The no-fallback
>> > list contains the zones from the local node and fallback (which gets
>> > used more often than the no-fallback) list contains all zones either
>> > in node-ordered or zone-ordered manner. In most of the platforms the
>> > default being the node order but the sequence of present nodes in
>> > that order is determined by various factors like NUMA distance, load,
>> > presence of CPUs on the node etc. This order of nodes in the fallback
>> > list is the most important information derived out of this interface.
>> >
> The point is that all of this can be inferred with information already
> provided, so the additional interface seems unnecessary. The only
> extension I think that is needed is to determine if the order is node or
> zone when vm.numa_zonelist_order == default and we shouldn't parse this
> from dmesg.
Okay. Seems like the general view is that this interface is not necessary.
Hence wont be posting the debugfs version for now.
next prev parent reply other threads:[~2016-10-13 20:10 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-06 5:34 [PATCH V2 1/2] mm: Export definition of 'zone_names' array through mmzone.h Anshuman Khandual
2016-09-06 5:34 ` [PATCH V2 2/2] mm: Add sysfs interface to dump each node's zonelist information Anshuman Khandual
2016-09-06 6:11 ` kbuild test robot
2016-09-06 6:49 ` Anshuman Khandual
2016-09-06 8:31 ` [PATCH V3] " Anshuman Khandual
2016-09-06 9:05 ` kbuild test robot
2016-09-07 12:32 ` Anshuman Khandual
2016-09-06 20:36 ` Dave Hansen
2016-09-07 3:08 ` Kees Cook
2016-09-07 4:00 ` Anshuman Khandual
2016-09-08 2:46 ` [PATCH V4] " Anshuman Khandual
2016-09-08 7:44 ` kbuild test robot
2016-09-08 20:24 ` Dave Hansen
2016-09-12 5:27 ` Anshuman Khandual
2016-09-12 18:13 ` David Rientjes
2016-09-17 4:26 ` Anshuman Khandual
2016-09-20 0:54 ` David Rientjes
2016-10-13 14:38 ` Anshuman Khandual [this message]
2016-09-09 13:36 ` Michal Hocko
2016-09-12 5:24 ` Anshuman Khandual
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