linux-kernel - Re: [PATCH 3/3] Count the number of times zone

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Message-Id: <20090615141912.878168ca.akpm@linux-foundation.org>
Date:	Mon, 15 Jun 2009 14:19:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	mel@....ul.ie, kosaki.motohiro@...fujitsu.com, riel@...hat.com,
	cl@...ux-foundation.org, fengguang.wu@...el.com,
	linuxram@...ibm.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Count the number of times zone_reclaim() scans and
 fails

On Thu, 11 Jun 2009 11:47:53 +0100
Mel Gorman <mel@....ul.ie> wrote:

> +		PGSCAN_ZONERECLAIM_FAILED,
> @@ -2492,6 +2492,9 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
> +	"zreclaim_failed",

So we have "zonereclaim", "zone_reclaim" and "zreclaim", which isn't
terribly developer-friendly.


This?

--- a/include/linux/vmstat.h~vmscan-count-the-number-of-times-zone_reclaim-scans-and-fails-fix
+++ a/include/linux/vmstat.h
@@ -37,7 +37,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
 		FOR_ALL_ZONES(PGSCAN_KSWAPD),
 		FOR_ALL_ZONES(PGSCAN_DIRECT),
 #ifdef CONFIG_NUMA
-		PGSCAN_ZONERECLAIM_FAILED,
+		PGSCAN_ZONE_RECLAIM_FAILED,
 #endif
 		PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
 		PAGEOUTRUN, ALLOCSTALL, PGROTATED,
diff -puN mm/vmscan.c~vmscan-count-the-number-of-times-zone_reclaim-scans-and-fails-fix mm/vmscan.c
--- a/mm/vmscan.c~vmscan-count-the-number-of-times-zone_reclaim-scans-and-fails-fix
+++ a/mm/vmscan.c
@@ -2520,7 +2520,7 @@ int zone_reclaim(struct zone *zone, gfp_
 	zone_clear_flag(zone, ZONE_RECLAIM_LOCKED);
 
 	if (!ret)
-		count_vm_event(PGSCAN_ZONERECLAIM_FAILED);
+		count_vm_event(PGSCAN_ZONE_RECLAIM_FAILED);
 
 	return ret;
 }
diff -puN mm/vmstat.c~vmscan-count-the-number-of-times-zone_reclaim-scans-and-fails-fix mm/vmstat.c
--- a/mm/vmstat.c~vmscan-count-the-number-of-times-zone_reclaim-scans-and-fails-fix
+++ a/mm/vmstat.c
@@ -674,7 +674,7 @@ static const char * const vmstat_text[] 
 	TEXTS_FOR_ZONES("pgscan_direct")
 
 #ifdef CONFIG_NUMA
-	"zreclaim_failed",
+	"zone_reclaim_failed",
 #endif
 	"pginodesteal",
 	"slabs_scanned",
_

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