linux-kernel - Re: [PATCH 4/5] add isolate pages vmstat

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Message-Id: <20090709111458.238C.A69D9226@jp.fujitsu.com>
Date:	Thu,  9 Jul 2009 11:19:06 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 4/5] add isolate pages vmstat

> On Tue, 7 Jul 2009, KOSAKI Motohiro wrote:
> 
> > +++ b/include/linux/mmzone.h
> > @@ -100,6 +100,8 @@ enum zone_stat_item {
> >  	NR_BOUNCE,
> >  	NR_VMSCAN_WRITE,
> >  	NR_WRITEBACK_TEMP,	/* Writeback using temporary buffers */
> > +	NR_ISOLATED_ANON,	/* Temporary isolated pages from anon lru */
> > +	NR_ISOLATED_FILE,	/* Temporary isolated pages from file lru */
> 
> LRU counters are rarer in use then the counters used for dirty pages etc.
> 
> Could you move the counters for reclaim into a separate cacheline?
> 

Current definition is here.

dirty pages and other frequently used counter stay in first cache line.
NR_ISOLATED_(ANON|FILE) and other unfrequently used counter stay in second
cache line.

Do you mean we shouldn't use zone_stat_item for it?


---------------------------------------------------------
enum zone_stat_item {
        /* First 128 byte cacheline (assuming 64 bit words) */
        NR_FREE_PAGES,
        NR_LRU_BASE,
        NR_INACTIVE_ANON = NR_LRU_BASE, /* must match order of LRU_[IN]ACTIVE */
        NR_ACTIVE_ANON,         /*  "     "     "   "       "         */
        NR_INACTIVE_FILE,       /*  "     "     "   "       "         */
        NR_ACTIVE_FILE,         /*  "     "     "   "       "         */
        NR_UNEVICTABLE,         /*  "     "     "   "       "         */
        NR_MLOCK,               /* mlock()ed pages found and moved off LRU */
        NR_ANON_PAGES,  /* Mapped anonymous pages */
        NR_FILE_MAPPED, /* pagecache pages mapped into pagetables.
                           only modified from process context */
        NR_FILE_PAGES,
        NR_FILE_DIRTY,
        NR_WRITEBACK,
        NR_SLAB_RECLAIMABLE,
        NR_SLAB_UNRECLAIMABLE,
        NR_PAGETABLE,           /* used for pagetables */
        NR_KERNEL_STACK,
        /* Second 128 byte cacheline */
        NR_UNSTABLE_NFS,        /* NFS unstable pages */
        NR_BOUNCE,
        NR_VMSCAN_WRITE,
        NR_WRITEBACK_TEMP,      /* Writeback using temporary buffers */
        NR_ISOLATED_ANON,       /* Temporary isolated pages from anon lru */
        NR_ISOLATED_FILE,       /* Temporary isolated pages from file lru */
        NR_SHMEM,               /* shmem pages (included tmpfs/GEM pages) */
#ifdef CONFIG_NUMA
        NUMA_HIT,               /* allocated in intended node */
        NUMA_MISS,              /* allocated in non intended node */
        NUMA_FOREIGN,           /* was intended here, hit elsewhere */
        NUMA_INTERLEAVE_HIT,    /* interleaver preferred this zone */
        NUMA_LOCAL,             /* allocation from local node */
        NUMA_OTHER,             /* allocation from other node */
#endif
        NR_VM_ZONE_STAT_ITEMS };





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