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    Subject[PATCH 07/21] Split NR_ANON off from NR_MAPPED
    Subject: zoned VM stats: Add NR_ANON
    From: Christoph Lameter <clameter@sgi.com>

    The current NR_MAPPED is used by zone reclaim and the dirty load
    calculation as the number of mapped pagecache pages. However, that is not
    true. NR_MAPPED includes the mapped anonymous pages. This patch
    separates those and therefore allows an accurate tracking of the anonymous
    pages per zone.

    It then becomes possible to determine the number of unmapped pages
    per zone and we can avoid scanning for unmapped pages if there
    are none.

    Also it may now be possible to determine the mapped/unmapped ratio in
    get_dirty_limit. Isnt the number of anonymous pages irrelevant in that
    calculation?

    Note that this will change the meaning of the number of mapped pages
    reported in /proc/vmstat /proc/meminfo and in the per node statistics.
    This may affect user space tools that monitor these counters!
    NR_MAPPED works like NR_DIRTY. It is only valid for pagecache pages.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>
    Signed-off-by: Andrew Morton <akpm@osdl.org>

    Index: linux-2.6.17-rc6-cl/fs/proc/proc_misc.c
    ===================================================================
    --- linux-2.6.17-rc6-cl.orig/fs/proc/proc_misc.c 2006-06-12 13:00:50.578578181 -0700
    +++ linux-2.6.17-rc6-cl/fs/proc/proc_misc.c 2006-06-12 13:01:30.621020255 -0700
    @@ -168,6 +168,7 @@ static int meminfo_read_proc(char *page,
    "SwapFree: %8lu kB\n"
    "Dirty: %8lu kB\n"
    "Writeback: %8lu kB\n"
    + "Anonymous: %8lu kB\n"
    "Mapped: %8lu kB\n"
    "Slab: %8lu kB\n"
    "CommitLimit: %8lu kB\n"
    @@ -191,6 +192,7 @@ static int meminfo_read_proc(char *page,
    K(i.freeswap),
    K(ps.nr_dirty),
    K(ps.nr_writeback),
    + K(global_page_state(NR_ANON)),
    K(global_page_state(NR_MAPPED)),
    K(ps.nr_slab),
    K(allowed),
    Index: linux-2.6.17-rc6-cl/include/linux/mmzone.h
    ===================================================================
    --- linux-2.6.17-rc6-cl.orig/include/linux/mmzone.h 2006-06-12 13:00:50.585413695 -0700
    +++ linux-2.6.17-rc6-cl/include/linux/mmzone.h 2006-06-12 13:01:30.622973259 -0700
    @@ -47,7 +47,8 @@ struct zone_padding {
    #endif

    enum zone_stat_item {
    - NR_MAPPED, /* mapped into pagetables.
    + NR_ANON, /* Mapped anonymous pages */
    + NR_MAPPED, /* pagecache pages mapped into pagetables.
    only modified from process context */
    NR_PAGECACHE,
    NR_STAT_ITEMS };
    Index: linux-2.6.17-rc6-cl/mm/rmap.c
    ===================================================================
    --- linux-2.6.17-rc6-cl.orig/mm/rmap.c 2006-06-12 12:57:23.386331148 -0700
    +++ linux-2.6.17-rc6-cl/mm/rmap.c 2006-06-12 13:01:30.623949761 -0700
    @@ -455,7 +455,7 @@ static void __page_set_anon_rmap(struct
    * nr_mapped state can be updated without turning off
    * interrupts because it is not modified via interrupt.
    */
    - __inc_zone_page_state(page, NR_MAPPED);
    + __inc_zone_page_state(page, NR_ANON);
    }

    /**
    @@ -531,7 +531,8 @@ void page_remove_rmap(struct page *page)
    */
    if (page_test_and_clear_dirty(page))
    set_page_dirty(page);
    - __dec_zone_page_state(page, NR_MAPPED);
    + __dec_zone_page_state(page,
    + PageAnon(page) ? NR_ANON : NR_MAPPED);
    }
    }

    Index: linux-2.6.17-rc6-cl/mm/vmscan.c
    ===================================================================
    --- linux-2.6.17-rc6-cl.orig/mm/vmscan.c 2006-06-12 13:01:27.580192947 -0700
    +++ linux-2.6.17-rc6-cl/mm/vmscan.c 2006-06-12 13:01:30.624926263 -0700
    @@ -747,7 +747,8 @@ static void shrink_active_list(unsigned
    * how much memory
    * is mapped.
    */
    - mapped_ratio = (global_page_state(NR_MAPPED) * 100) /
    + mapped_ratio = ((global_page_state(NR_MAPPED) +
    + global_page_state(NR_ANON)) * 100) /
    vm_total_pages;

    /*
    Index: linux-2.6.17-rc6-cl/drivers/base/node.c
    ===================================================================
    --- linux-2.6.17-rc6-cl.orig/drivers/base/node.c 2006-06-12 13:00:50.587366699 -0700
    +++ linux-2.6.17-rc6-cl/drivers/base/node.c 2006-06-12 13:01:30.625902765 -0700
    @@ -71,6 +71,7 @@ static ssize_t node_read_meminfo(struct
    "Node %d Writeback: %8lu kB\n"
    "Node %d PageCache: %8lu kB\n"
    "Node %d Mapped: %8lu kB\n"
    + "Node %d Anonymous: %8lu kB\n"
    "Node %d Slab: %8lu kB\n",
    nid, K(i.totalram),
    nid, K(i.freeram),
    @@ -85,6 +86,7 @@ static ssize_t node_read_meminfo(struct
    nid, K(ps.nr_writeback),
    nid, K(node_page_state(nid, NR_PAGECACHE)),
    nid, K(node_page_state(nid, NR_MAPPED)),
    + nid, K(node_page_state(nid, NR_ANON)),
    nid, K(ps.nr_slab));
    n += hugetlb_report_node_meminfo(nid, buf + n);
    return n;
    Index: linux-2.6.17-rc6-cl/mm/page-writeback.c
    ===================================================================
    --- linux-2.6.17-rc6-cl.orig/mm/page-writeback.c 2006-06-12 12:57:23.386331148 -0700
    +++ linux-2.6.17-rc6-cl/mm/page-writeback.c 2006-06-12 13:01:30.625902765 -0700
    @@ -111,7 +111,8 @@ static void get_writeback_state(struct w
    {
    wbs->nr_dirty = read_page_state(nr_dirty);
    wbs->nr_unstable = read_page_state(nr_unstable);
    - wbs->nr_mapped = global_page_state(NR_MAPPED);
    + wbs->nr_mapped = global_page_state(NR_MAPPED) +
    + global_page_state(NR_ANON);
    wbs->nr_writeback = read_page_state(nr_writeback);
    }

    Index: linux-2.6.17-rc6-cl/mm/vmstat.c
    ===================================================================
    --- linux-2.6.17-rc6-cl.orig/mm/vmstat.c 2006-06-12 13:01:24.304028650 -0700
    +++ linux-2.6.17-rc6-cl/mm/vmstat.c 2006-06-12 13:02:08.289585892 -0700
    @@ -465,6 +465,7 @@ static char *vmstat_text[] = {
    /* Zoned VM counters */
    "nr_mapped",
    "nr_pagecache",
    + "nr_anon",

    /* Page state */
    "nr_dirty",
    -
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