linux-kernel - Re: [PATCH -mm] mm: Fix memory hotplug + sparsemem build.

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Message-Id: <20070911182546.F139.Y-GOTO@jp.fujitsu.com>
Date:	Tue, 11 Sep 2007 18:37:12 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Andy Whitcroft <apw@...dowen.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH -mm] mm: Fix memory hotplug + sparsemem build.


> > +	if (onlined_pages){
> 
> Nit, needs a space there before the '{'.

Ah, Ok. I attached fixed patch in this mail.

> The problem as I see it is that when we boot the system we start a
> kswapd on all nodes with memory.  If the hot-add adds memory to a
> pre-existing node with no memory we will not start one and we end up
> with a node with memory and no kswapd.  Bad.
> 
> As kswapd_run is a no-op when a kswapd already exists this seems a safe
> way to fix that.  Paul's ->zone conversion is obviously correct also.
> 
> Acked-by: Andy Whitcroft <apw@...dowen.org>

Thanks for your explanation.
You mentioned all of my intention correctly. :-)


----

Fix kswapd doesn't run when memory is added on memory-less-node.
Fix compile error of zone->node when CONFIG_NUMA is off.

Signed-off-by: Yasunori Goto <y-goto@...fujitsu.com>
Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
Acked-by: Andy Whitcroft <apw@...dowen.org>


---
 mm/memory_hotplug.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Index: current/mm/memory_hotplug.c
===================================================================
--- current.orig/mm/memory_hotplug.c	2007-09-07 18:08:07.000000000 +0900
+++ current/mm/memory_hotplug.c	2007-09-11 17:29:19.000000000 +0900
@@ -211,10 +211,12 @@ int online_pages(unsigned long pfn, unsi
 		online_pages_range);
 	zone->present_pages += onlined_pages;
 	zone->zone_pgdat->node_present_pages += onlined_pages;
-	if (onlined_pages)
-		node_set_state(zone->node, N_HIGH_MEMORY);
 
 	setup_per_zone_pages_min();
+	if (onlined_pages) {
+		kswapd_run(zone_to_nid(zone));
+		node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
+	}
 
 	if (need_zonelists_rebuild)
 		build_all_zonelists();
@@ -269,9 +271,6 @@ int add_memory(int nid, u64 start, u64 s
 		if (!pgdat)
 			return -ENOMEM;
 		new_pgdat = 1;
-		ret = kswapd_run(nid);
-		if (ret)
-			goto error;
 	}
 
 	/* call arch's memory hotadd */

-- 
Yasunori Goto 


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