/proc/pid/smaps: show VM_SOFTDIRTY flag in VmFlags line

This flag shows that the VMA is "newly created" and thus represents
"dirty" in the task's VM.

You can clear it by "echo 4 > /proc/pid/clear_refs."

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9f1369fe0afb..abbe825d20ff 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -561,6 +561,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
                 [ilog2(VM_NONLINEAR)]   = "nl",
                 [ilog2(VM_ARCH_1)]      = "ar",
                 [ilog2(VM_DONTDUMP)]    = "dd",
+#ifdef CONFIG_MEM_SOFT_DIRTY
+                [ilog2(VM_SOFTDIRTY)]   = "sd",
+#endif
                 [ilog2(VM_MIXEDMAP)]    = "mm",
                 [ilog2(VM_HUGEPAGE)]    = "hg",
                 [ilog2(VM_NOHUGEPAGE)]  = "nh",