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Subject[RFC] Track mlock()ed pages
Add NR_MLOCK

Track mlocked pages via a ZVC

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.20-rc6/include/linux/mmzone.h
===================================================================
--- linux-2.6.20-rc6.orig/include/linux/mmzone.h 2007-01-25 20:29:58.000000000 -0800
+++ linux-2.6.20-rc6/include/linux/mmzone.h 2007-01-25 20:31:23.000000000 -0800
@@ -58,6 +58,7 @@ enum zone_stat_item {
NR_FILE_DIRTY,
NR_WRITEBACK,
/* Second 128 byte cacheline */
+ NR_MLOCK, /* Mlocked pages */
NR_SLAB_RECLAIMABLE,
NR_SLAB_UNRECLAIMABLE,
NR_PAGETABLE, /* used for pagetables */
Index: linux-2.6.20-rc6/mm/rmap.c
===================================================================
--- linux-2.6.20-rc6.orig/mm/rmap.c 2007-01-25 20:18:38.000000000 -0800
+++ linux-2.6.20-rc6/mm/rmap.c 2007-01-25 20:31:23.000000000 -0800
@@ -551,6 +551,8 @@ void page_add_new_anon_rmap(struct page
{
atomic_set(&page->_mapcount, 0); /* elevate count by 1 (starts at -1) */
__page_set_anon_rmap(page, vma, address);
+ if (vma->vm_flags & VM_LOCKED)
+ __inc_zone_page_state(page, NR_MLOCK);
}

/**
@@ -565,6 +567,16 @@ void page_add_file_rmap(struct page *pag
__inc_zone_page_state(page, NR_FILE_MAPPED);
}

+/*
+ * Add an rmap in a known vma. This allows us to update the mlock counter.
+ */
+void page_add_file_rmap_vma(struct page *page, struct vm_area_struct *vma)
+{
+ page_add_file_rmap(page);
+ if (vma->vm_flags & VM_LOCKED)
+ __inc_zone_page_state(page, NR_MLOCK);
+}
+
/**
* page_remove_rmap - take down pte mapping from a page
* @page: page to remove mapping from
@@ -602,6 +614,8 @@ void page_remove_rmap(struct page *page,
__dec_zone_page_state(page,
PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED);
}
+ if (vma->vm_flags & VM_LOCKED)
+ __dec_zone_page_state(page, NR_MLOCK);
}

/*
Index: linux-2.6.20-rc6/include/linux/rmap.h
===================================================================
--- linux-2.6.20-rc6.orig/include/linux/rmap.h 2007-01-25 20:18:38.000000000 -0800
+++ linux-2.6.20-rc6/include/linux/rmap.h 2007-01-25 20:31:23.000000000 -0800
@@ -72,6 +72,7 @@ void __anon_vma_link(struct vm_area_stru
void page_add_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_file_rmap(struct page *);
+void page_add_file_rmap_vma(struct page *, struct vm_area_struct *);
void page_remove_rmap(struct page *, struct vm_area_struct *);

/**
Index: linux-2.6.20-rc6/mm/fremap.c
===================================================================
--- linux-2.6.20-rc6.orig/mm/fremap.c 2007-01-25 20:18:38.000000000 -0800
+++ linux-2.6.20-rc6/mm/fremap.c 2007-01-25 20:31:23.000000000 -0800
@@ -81,7 +81,7 @@ int install_page(struct mm_struct *mm, s
flush_icache_page(vma, page);
pte_val = mk_pte(page, prot);
set_pte_at(mm, addr, pte, pte_val);
- page_add_file_rmap(page);
+ page_add_file_rmap_vma(page, vma);
update_mmu_cache(vma, addr, pte_val);
lazy_mmu_prot_update(pte_val);
err = 0;
Index: linux-2.6.20-rc6/mm/memory.c
===================================================================
--- linux-2.6.20-rc6.orig/mm/memory.c 2007-01-25 20:18:38.000000000 -0800
+++ linux-2.6.20-rc6/mm/memory.c 2007-01-25 20:31:23.000000000 -0800
@@ -2256,7 +2256,7 @@ retry:
page_add_new_anon_rmap(new_page, vma, address);
} else {
inc_mm_counter(mm, file_rss);
- page_add_file_rmap(new_page);
+ page_add_file_rmap_vma(new_page, vma);
if (write_access) {
dirty_page = new_page;
get_page(dirty_page);
Index: linux-2.6.20-rc6/drivers/base/node.c
===================================================================
--- linux-2.6.20-rc6.orig/drivers/base/node.c 2007-01-25 20:30:17.000000000 -0800
+++ linux-2.6.20-rc6/drivers/base/node.c 2007-01-25 20:31:23.000000000 -0800
@@ -60,6 +60,7 @@ static ssize_t node_read_meminfo(struct
"Node %d FilePages: %8lu kB\n"
"Node %d Mapped: %8lu kB\n"
"Node %d AnonPages: %8lu kB\n"
+ "Node %d Mlock: %8lu KB\n"
"Node %d PageTables: %8lu kB\n"
"Node %d NFS_Unstable: %8lu kB\n"
"Node %d Bounce: %8lu kB\n"
@@ -82,6 +83,7 @@ static ssize_t node_read_meminfo(struct
nid, K(node_page_state(nid, NR_FILE_PAGES)),
nid, K(node_page_state(nid, NR_FILE_MAPPED)),
nid, K(node_page_state(nid, NR_ANON_PAGES)),
+ nid, K(node_page_state(nid, NR_MLOCK)),
nid, K(node_page_state(nid, NR_PAGETABLE)),
nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
nid, K(node_page_state(nid, NR_BOUNCE)),
Index: linux-2.6.20-rc6/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.20-rc6.orig/fs/proc/proc_misc.c 2007-01-25 20:30:21.000000000 -0800
+++ linux-2.6.20-rc6/fs/proc/proc_misc.c 2007-01-25 20:31:23.000000000 -0800
@@ -166,6 +166,7 @@ static int meminfo_read_proc(char *page,
"Writeback: %8lu kB\n"
"AnonPages: %8lu kB\n"
"Mapped: %8lu kB\n"
+ "Mlock: %8lu KB\n"
"Slab: %8lu kB\n"
"SReclaimable: %8lu kB\n"
"SUnreclaim: %8lu kB\n"
@@ -196,6 +197,7 @@ static int meminfo_read_proc(char *page,
K(global_page_state(NR_WRITEBACK)),
K(global_page_state(NR_ANON_PAGES)),
K(global_page_state(NR_FILE_MAPPED)),
+ K(global_page_state(NR_MLOCK)),
K(global_page_state(NR_SLAB_RECLAIMABLE) +
global_page_state(NR_SLAB_UNRECLAIMABLE)),
K(global_page_state(NR_SLAB_RECLAIMABLE)),
Index: linux-2.6.20-rc6/mm/vmstat.c
===================================================================
--- linux-2.6.20-rc6.orig/mm/vmstat.c 2007-01-25 20:30:21.000000000 -0800
+++ linux-2.6.20-rc6/mm/vmstat.c 2007-01-25 20:31:23.000000000 -0800
@@ -433,6 +433,7 @@ static const char * const vmstat_text[]
"nr_file_pages",
"nr_dirty",
"nr_writeback",
+ "nr_mlock",
"nr_slab_reclaimable",
"nr_slab_unreclaimable",
"nr_page_table_pages",
-
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