From 6e21c8f145f5052c1c2fb4a4b41bee01c848159b Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Sat, 3 Sep 2005 15:54:45 -0700 Subject: [PATCH] /proc//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//numa_maps that gives more information about the vma's of a process. numa_maps is indexes by the start address found in /proc//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: Links to information in /proc//map This can be "default" "interleave={}", "prefer=" or "bind={}" MaxRef= Pages= Mapped= Anon= Nx= 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 Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/mempolicy.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'mm') diff --git a/mm/mempolicy.c b/mm/mempolicy.c index b4eababc819..13492d66b7c 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, #endif /* Return effective policy for a VMA */ -static struct mempolicy * -get_vma_policy(struct vm_area_struct *vma, unsigned long addr) +struct mempolicy * +get_vma_policy(struct task_struct *task, struct vm_area_struct *vma, unsigned long addr) { - struct mempolicy *pol = current->mempolicy; + struct mempolicy *pol = task->mempolicy; if (vma) { 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 struct page * alloc_page_vma(unsigned int __nocast gfp, struct vm_area_struct *vma, unsigned long addr) { - struct mempolicy *pol = get_vma_policy(vma, addr); + struct mempolicy *pol = get_vma_policy(current, vma, addr); cpuset_update_current_mems_allowed(); @@ -908,7 +908,7 @@ void __mpol_free(struct mempolicy *p) /* Find first node suitable for an allocation */ int mpol_first_node(struct vm_area_struct *vma, unsigned long addr) { - struct mempolicy *pol = get_vma_policy(vma, addr); + struct mempolicy *pol = get_vma_policy(current, vma, addr); switch (pol->policy) { case MPOL_DEFAULT: @@ -928,7 +928,7 @@ int mpol_first_node(struct vm_area_struct *vma, unsigned long addr) /* Find secondary valid nodes for an allocation */ int mpol_node_valid(int nid, struct vm_area_struct *vma, unsigned long addr) { - struct mempolicy *pol = get_vma_policy(vma, addr); + struct mempolicy *pol = get_vma_policy(current, vma, addr); switch (pol->policy) { case MPOL_PREFERRED: -- cgit v1.2.3