Messages in this thread Patch in this message | | | Date | Tue, 1 Sep 2009 16:24:19 +0900 | From | Minchan Kim <> | Subject | Re: [PATCH mmotm] Fix NUMA accounting in numastat.txt |
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Hi, Kame.
On Tue, 1 Sep 2009 16:17:21 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> On Tue, 1 Sep 2009 13:53:21 +0900 > Minchan Kim <minchan.kim@gmail.com> wrote: > > > > > In Documentation/numastat.txt, it confused me. > > For example, there are nodes [0,1] in system. > > > > barrios:~$ cat /proc/zoneinfo | egrep 'numa|zone' > > Node 0, zone DMA > > numa_hit 33226 > > numa_miss 1739 > > numa_foreign 27978 > > .. > > .. > > Node 1, zone DMA > > numa_hit 307 > > numa_miss 46900 > > numa_foreign 0 > > > > 1) In node 0, NUMA_MISS means it wanted to allocate page > > in node 1 but ended up with page in node 0 > > > > 2) In node 0, NUMA_FOREIGN means it wanted to allocate page > > in node 0 but ended up with page from Node 1. > > > > But now, numastat explains it oppositely about (MISS, FOREIGN). > > Let's fix up with viewpoint of zone. > > > > I'm confused....documentation is really bad ? > Implementation isn't ?
At that time, I though of it. But I knew code is right since zone_stat_item said follwing as. NUMA_MISS is rather unclear but NUMA_FOREIGN is clear, I think.
NUMA_MISS, /* allocated in non intended node */ NUMA_FOREIGN, /* was intended here, hit elsewhere */
Also I am worry about legacy tools related to NUMA but I don't know it. Code change will break them.
> Hmm, this function ? > == > void zone_statistics(struct zone *preferred_zone, struct zone *z) > { > if (z->zone_pgdat == preferred_zone->zone_pgdat) { > __inc_zone_state(z, NUMA_HIT); > } else { > __inc_zone_state(z, NUMA_MISS); > __inc_zone_state(preferred_zone, NUMA_FOREIGN); > } > if (z->node == numa_node_id()) > __inc_zone_state(z, NUMA_LOCAL); > else > __inc_zone_state(z, NUMA_OTHER); > } > == > I wonder > == > void zone_statistics(struct zone *preferred_zone, struct zone *z) > { > if (z->zone_pgdat == preferred_zone->zone_pgdat) { > __inc_zone_state(z, NUMA_HIT); > } else { > __inc_zone_state(preferred_zone, NUMA_MISS); > __inc_zone_state(z, NUMA_FOREIGN); > } > if (z->node == numa_node_id()) > __inc_zone_state(z, NUMA_LOCAL); > else > __inc_zone_state(z, NUMA_OTHER); > } > == > Is correct fix .... > > Thanks, > -Kame > > > > Signed-off-by: Minchan Kim <minchan.kim@gmail.com> > > --- > > Documentation/numastat.txt | 8 ++++---- > > 1 files changed, 4 insertions(+), 4 deletions(-) > > > > diff --git a/Documentation/numastat.txt b/Documentation/numastat.txt > > index 80133ac..9fcc9a6 100644 > > --- a/Documentation/numastat.txt > > +++ b/Documentation/numastat.txt > > @@ -7,10 +7,10 @@ All units are pages. Hugepages have separate counters. > > > > numa_hit A process wanted to allocate memory from this node, > > and succeeded. > > -numa_miss A process wanted to allocate memory from this node, > > - but ended up with memory from another. > > -numa_foreign A process wanted to allocate on another node, > > - but ended up with memory from this one. > > +numa_miss A process wanted to allocate memory from another node, > > + but ended up with memory from this node. > > +numa_foreign A process wanted to allocate on this node, > > + but ended up with memory from another one. > > local_node A process ran on this node and got memory from it. > > other_node A process ran on this node and got memory from another node. > > interleave_hit Interleaving wanted to allocate from this node > > -- > > 1.5.4.3 > > > > > > > > -- > > Kind regards, > > Minchan Kim > > > > -- > > To unsubscribe, send a message with 'unsubscribe linux-mm' in > > the body to majordomo@kvack.org. For more info on Linux MM, > > see: http://www.linux-mm.org/ . > > Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> > > >
-- Kind regards, Minchan Kim
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