From: David Rientjes <rientjes@google.com>
To: 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: Mon, 19 Sep 2016 17:54:26 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.10.1609191752080.53329@chino.kir.corp.google.com> (raw)
In-Reply-To: <57DCC605.10305@linux.vnet.ibm.com>
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.
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next prev parent reply other threads:[~2016-09-20 0:54 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 [this message]
2016-10-13 14:38 ` Anshuman Khandual
2016-09-09 13:36 ` Michal Hocko
2016-09-12 5:24 ` Anshuman Khandual
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