Messages in this thread | | | Date | Wed, 19 Feb 2014 08:24:38 -0800 | From | Nishanth Aravamudan <> | Subject | Re: ppc: RECLAIM_DISTANCE 10? |
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On 18.02.2014 [17:43:38 -0800], David Rientjes wrote: > On Tue, 18 Feb 2014, Nishanth Aravamudan wrote: > > > How about the following? > > > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > > index 5de4337..1a0eced 100644 > > --- a/mm/page_alloc.c > > +++ b/mm/page_alloc.c > > @@ -1854,7 +1854,8 @@ static void __paginginit init_zone_allows_reclaim(int nid) > > int i; > > > > for_each_online_node(i) > > - if (node_distance(nid, i) <= RECLAIM_DISTANCE) > > + if (node_distance(nid, i) <= RECLAIM_DISTANCE || > > + !NODE_DATA(i)->node_present_pages) > > node_set(i, NODE_DATA(nid)->reclaim_nodes); > > else > > zone_reclaim_mode = 1; > > [ I changed the above from NODE_DATA(nid) -> NODE_DATA(i) as you caught > so we're looking at the right code. ] > > That can't be right, it would allow reclaiming from a memoryless node. I > think what you want is
Gah, you're right.
> for_each_online_node(i) { > if (!node_present_pages(i)) > continue; > if (node_distance(nid, i) <= RECLAIM_DISTANCE) { > node_set(i, NODE_DATA(nid)->reclaim_nodes); > continue; > } > /* Always try to reclaim locally */ > zone_reclaim_mode = 1; > } > > but we really should be able to do for_each_node_state(i, N_MEMORY) here > and memoryless nodes should already be excluded from that mask.
Yep, I found that afterwards, which simplifies the logic. I'll add this to my series :)
<snip>
> > I think it's safe to move init_zone_allows_reclaim, because I don't > > think any allocates are occurring here that could cause us to reclaim > > anyways, right? Moving it allows us to safely reference > > node_present_pages. > > > > Yeah, this is fine.
Thanks, Nish
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