[RFC][PATCH] add pagesize field to /proc/pid/numa_maps

[Petr Holasek]

There were some similar attempts to add vma's pagesize to numa_maps in the past,
so I've distilled the most straightforward one - adding pagesize field
expressing size in kbytes to each line. Although page size can be also obtained
from smaps file, adding pagesize to numa_maps makes the interface more compact
and easier to use without need for traversing other files.

New numa_maps output looks like that:

2aaaaac00000 default file=/dev/hugepages/hugepagefile huge pagesize=2097152 dirty=1 N0=1
7f302441a000 default file=/usr/lib64/libc-2.17.so pagesize=4096 mapped=65 mapmax=38 N0=65

Signed-off-by: Petr Holasek <pholasek@xxxxxxxxxx>
---
 fs/proc/task_mmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 4e0388c..964c4de 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1498,6 +1498,9 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
 	if (!md->pages)
 		goto out;
 
+	seq_puts(m, " pagesize=");
+	seq_printf(m, "%lu", vma_kernel_pagesize(vma));
+
 	if (md->anon)
 		seq_printf(m, " anon=%lu", md->anon);
 
-- 
1.9.3

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