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Subject[PATCH V2 3/6] Provide process address range to numa node id mapping
Date
This patch provides process address range to numa node information
thru /proc/<pid>/numa_vamaps file. For address ranges not having
any pages mapped, a '-' is printed instead of the numa node id.

Following is the sample of the file format

00400000-00410000 N1
00410000-0047f000 N0
0047f000-00480000 N2
00480000-00481000 -
00481000-004a0000 N0
004a0000-004a2000 -
004a2000-004aa000 N2
004aa000-004ad000 N0
004ad000-004ae000 -
..

Signed-off-by: Prakash Sangappa <prakash.sangappa@oracle.com>
Reviewed-by: Steve Sistare <steven.sistare@oracle.com>
---
fs/proc/task_mmu.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 158 insertions(+)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 02b553c..1371e379 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1845,6 +1845,162 @@ static int show_numa_map(struct seq_file *m, void *v)
return 0;
}

+static int gather_hole_info_vamap(unsigned long start, unsigned long end,
+ struct mm_walk *walk)
+{
+ struct numa_maps *md = walk->private;
+ struct vm_area_struct *vma = walk->vma;
+
+ /*
+ * If in a nid, end walk at hole start.
+ * If no nid and vma changes, end walk at next vma start.
+ */
+ if (md->nid >= 0 || vma != find_vma(walk->mm, start)) {
+ md->nextaddr = start;
+ return 1;
+ }
+
+ if (md->nid == NUMA_VAMAPS_NID_NONE)
+ md->nid = NUMA_VAMAPS_NID_NOPAGES;
+
+ return 0;
+}
+
+static int vamap_vprintf(struct numa_vamaps_private *nvm, const char *f, ...)
+{
+ va_list args;
+ int len, space;
+
+ space = NUMA_VAMAPS_BUFSZ - nvm->count;
+ va_start(args, f);
+ len = vsnprintf(nvm->buf + nvm->count, space, f, args);
+ va_end(args);
+ if (len < space) {
+ nvm->count += len;
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * Display va-range to numa node info via /proc
+ */
+static ssize_t numa_vamaps_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct numa_vamaps_private *nvm = file->private_data;
+ struct vm_area_struct *vma, *tailvma;
+ struct numa_maps *md = &nvm->md;
+ struct mm_struct *mm = nvm->mm;
+ u64 vm_start = nvm->vm_start;
+ size_t ucount;
+ struct mm_walk walk = {
+ .hugetlb_entry = gather_hugetlb_stats,
+ .pmd_entry = gather_pte_stats,
+ .pte_hole = gather_hole_info_vamap,
+ .private = md,
+ .mm = mm,
+ };
+ int ret = 0, copied = 0, done = 0;
+
+ if (!mm || !mmget_not_zero(mm))
+ return 0;
+
+ if (count <= 0)
+ goto out_mm;
+
+ /* First copy leftover contents in buffer */
+ if (nvm->from)
+ goto docopy;
+
+repeat:
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, vm_start);
+ if (!vma) {
+ done = 1;
+ goto out;
+ }
+
+ if (vma->vm_start > vm_start)
+ vm_start = vma->vm_start;
+
+ while (nvm->count < count) {
+ u64 vm_end;
+
+ /* Ensure we start with an empty numa_maps statistics */
+ memset(md, 0, sizeof(*md));
+ md->nid = NUMA_VAMAPS_NID_NONE; /* invalid nodeid at start */
+ md->nextaddr = 0;
+ md->isvamaps = 1;
+
+ if (walk_page_range(vm_start, vma->vm_end, &walk) < 0)
+ break;
+
+ /* nextaddr ends the range. if 0, reached the vma end */
+ vm_end = (md->nextaddr ? md->nextaddr : vma->vm_end);
+
+ /* break if buffer full */
+ if (md->nid >= 0 && md->node[md->nid]) {
+ if (vamap_vprintf(nvm, "%08lx-%08lx N%ld\n", vm_start,
+ vm_end, md->nid))
+ break;
+ } else if (vamap_vprintf(nvm, "%08lx-%08lx - \n", vm_start,
+ vm_end)) {
+ break;
+ }
+
+ /* advance to next VA */
+ vm_start = vm_end;
+ if (vm_end == vma->vm_end) {
+ vma = vma->vm_next;
+ if (!vma) {
+ done = 1;
+ break;
+ }
+ vm_start = vma->vm_start;
+ }
+ }
+out:
+ /* last, add gate vma details */
+ if (!vma && (tailvma = get_gate_vma(mm)) != NULL &&
+ vm_start < tailvma->vm_end) {
+ done = 0;
+ if (!vamap_vprintf(nvm, "%08lx-%08lx - \n",
+ tailvma->vm_start, tailvma->vm_end)) {
+ done = 1;
+ vm_start = tailvma->vm_end;
+ }
+ }
+
+ up_read(&mm->mmap_sem);
+docopy:
+ ucount = min(count, nvm->count);
+ if (ucount && copy_to_user(buf, nvm->buf + nvm->from, ucount)) {
+ ret = -EFAULT;
+ goto out_mm;;
+ }
+ copied += ucount;
+ count -= ucount;
+ nvm->count -= ucount;
+ buf += ucount;
+ if (!done && count) {
+ nvm->from = 0;
+ goto repeat;
+ }
+ /* somthing left in the buffer */
+ if (nvm->count)
+ nvm->from += ucount;
+ else
+ nvm->from = 0;
+
+ nvm->vm_start = vm_start;
+ ret = copied;
+ *ppos += copied;
+out_mm:
+ mmput(mm);
+ return ret;
+}
+
static const struct seq_operations proc_pid_numa_maps_op = {
.start = m_start,
.next = m_next,
@@ -1895,6 +2051,8 @@ const struct file_operations proc_pid_numa_maps_operations = {

const struct file_operations proc_numa_vamaps_operations = {
.open = numa_vamaps_open,
+ .read = numa_vamaps_read,
+ .llseek = noop_llseek,
.release = numa_vamaps_release,
};
#endif /* CONFIG_NUMA */
--
2.7.4
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