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authorChristoph Lameter <clameter@engr.sgi.com>2005-09-03 18:54:45 -0400
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 03:05:43 -0400
commit6e21c8f145f5052c1c2fb4a4b41bee01c848159b (patch)
tree0b956cfbd67636c19be79fc0cbe0a5ed89fb6b9a /mm/mempolicy.c
parent839b9685e80592809d6dfdd865986cd1b5ddc2fb (diff)
[PATCH] /proc/<pid>/numa_maps to show on which nodes pages reside
This patch was recently discussed on linux-mm: http://marc.theaimsgroup.com/?t=112085728500002&r=1&w=2 I inherited a large code base from Ray for page migration. There was a small patch in there that I find to be very useful since it allows the display of the locality of the pages in use by a process. I reworked that patch and came up with a /proc/<pid>/numa_maps that gives more information about the vma's of a process. numa_maps is indexes by the start address found in /proc/<pid>/maps. F.e. with this patch you can see the page use of the "getty" process: margin:/proc/12008 # cat maps 00000000-00004000 r--p 00000000 00:00 0 2000000000000000-200000000002c000 r-xp 00000000 08:04 516 /lib/ld-2.3.3.so 2000000000038000-2000000000040000 rw-p 00028000 08:04 516 /lib/ld-2.3.3.so 2000000000040000-2000000000044000 rw-p 2000000000040000 00:00 0 2000000000058000-2000000000260000 r-xp 00000000 08:04 54707842 /lib/tls/libc.so.6.1 2000000000260000-2000000000268000 ---p 00208000 08:04 54707842 /lib/tls/libc.so.6.1 2000000000268000-2000000000274000 rw-p 00200000 08:04 54707842 /lib/tls/libc.so.6.1 2000000000274000-2000000000280000 rw-p 2000000000274000 00:00 0 2000000000280000-20000000002b4000 r--p 00000000 08:04 9126923 /usr/lib/locale/en_US.utf8/LC_CTYPE 2000000000300000-2000000000308000 r--s 00000000 08:04 60071467 /usr/lib/gconv/gconv-modules.cache 2000000000318000-2000000000328000 rw-p 2000000000318000 00:00 0 4000000000000000-4000000000008000 r-xp 00000000 08:04 29576399 /sbin/mingetty 6000000000004000-6000000000008000 rw-p 00004000 08:04 29576399 /sbin/mingetty 6000000000008000-600000000002c000 rw-p 6000000000008000 00:00 0 [heap] 60000fff7fffc000-60000fff80000000 rw-p 60000fff7fffc000 00:00 0 60000ffffff44000-60000ffffff98000 rw-p 60000ffffff44000 00:00 0 [stack] a000000000000000-a000000000020000 ---p 00000000 00:00 0 [vdso] cat numa_maps 2000000000000000 default MaxRef=43 Pages=11 Mapped=11 N0=4 N1=3 N2=2 N3=2 2000000000038000 default MaxRef=1 Pages=2 Mapped=2 Anon=2 N0=2 2000000000040000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1 2000000000058000 default MaxRef=43 Pages=61 Mapped=61 N0=14 N1=15 N2=16 N3=16 2000000000268000 default MaxRef=1 Pages=2 Mapped=2 Anon=2 N0=2 2000000000274000 default MaxRef=1 Pages=3 Mapped=3 Anon=3 N0=3 2000000000280000 default MaxRef=8 Pages=3 Mapped=3 N0=3 2000000000300000 default MaxRef=8 Pages=2 Mapped=2 N0=2 2000000000318000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N2=1 4000000000000000 default MaxRef=6 Pages=2 Mapped=2 N1=2 6000000000004000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1 6000000000008000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1 60000fff7fffc000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1 60000ffffff44000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1 getty uses ld.so. The first vma is the code segment which is used by 43 other processes and the pages are evenly distributed over the 4 nodes. The second vma is the process specific data portion for ld.so. This is only one page. The display format is: <startaddress> Links to information in /proc/<pid>/map <memory policy> This can be "default" "interleave={}", "prefer=<node>" or "bind={<zones>}" MaxRef= <maximum reference to a page in this vma> Pages= <Nr of pages in use> Mapped= <Nr of pages with mapcount > Anon= <nr of anonymous pages> Nx= <Nr of pages on Node x> The content of the proc-file is self-evident. If this would be tied into the sparsemem system then the contents of this file would not be too useful. Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index b4eababc8198..13492d66b7c8 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -664,10 +664,10 @@ asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
664#endif 664#endif
665 665
666/* Return effective policy for a VMA */ 666/* Return effective policy for a VMA */
667static struct mempolicy * 667struct mempolicy *
668get_vma_policy(struct vm_area_struct *vma, unsigned long addr) 668get_vma_policy(struct task_struct *task, struct vm_area_struct *vma, unsigned long addr)
669{ 669{
670 struct mempolicy *pol = current->mempolicy; 670 struct mempolicy *pol = task->mempolicy;
671 671
672 if (vma) { 672 if (vma) {
673 if (vma->vm_ops && vma->vm_ops->get_policy) 673 if (vma->vm_ops && vma->vm_ops->get_policy)
@@ -786,7 +786,7 @@ static struct page *alloc_page_interleave(unsigned int __nocast gfp, unsigned or
786struct page * 786struct page *
787alloc_page_vma(unsigned int __nocast gfp, struct vm_area_struct *vma, unsigned long addr) 787alloc_page_vma(unsigned int __nocast gfp, struct vm_area_struct *vma, unsigned long addr)
788{ 788{
789 struct mempolicy *pol = get_vma_policy(vma, addr); 789 struct mempolicy *pol = get_vma_policy(current, vma, addr);
790 790
791 cpuset_update_current_mems_allowed(); 791 cpuset_update_current_mems_allowed();
792 792
@@ -908,7 +908,7 @@ void __mpol_free(struct mempolicy *p)
908/* Find first node suitable for an allocation */ 908/* Find first node suitable for an allocation */
909int mpol_first_node(struct vm_area_struct *vma, unsigned long addr) 909int mpol_first_node(struct vm_area_struct *vma, unsigned long addr)
910{ 910{
911 struct mempolicy *pol = get_vma_policy(vma, addr); 911 struct mempolicy *pol = get_vma_policy(current, vma, addr);
912 912
913 switch (pol->policy) { 913 switch (pol->policy) {
914 case MPOL_DEFAULT: 914 case MPOL_DEFAULT:
@@ -928,7 +928,7 @@ int mpol_first_node(struct vm_area_struct *vma, unsigned long addr)
928/* Find secondary valid nodes for an allocation */ 928/* Find secondary valid nodes for an allocation */
929int mpol_node_valid(int nid, struct vm_area_struct *vma, unsigned long addr) 929int mpol_node_valid(int nid, struct vm_area_struct *vma, unsigned long addr)
930{ 930{
931 struct mempolicy *pol = get_vma_policy(vma, addr); 931 struct mempolicy *pol = get_vma_policy(current, vma, addr);
932 932
933 switch (pol->policy) { 933 switch (pol->policy) {
934 case MPOL_PREFERRED: 934 case MPOL_PREFERRED: