Re: [RFC][-mm][PATCH 2/6] oom-killer: count swap usage per process.

David Rientjes
2009-11-03T19:47:36Z

On Mon, 2 Nov 2009, KAMEZAWA Hiroyuki wrote:

> Now, anon_rss and file_rss is counted as RSS and exported via /proc.
> RSS usage is important information but one more information which
> is often asked by users is "usage of swap".(user support team said.)
>
> This patch counts swap entry usage per process and show it via
> /proc/<pid>/status. I think status file is robust against new entry.
> Then, it is the first candidate..
>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Acked-by; David Rientjes <rientjes@google.com>

Thanks! I think this should be added to -mm now while the remainder of
your patchset is developed and reviewed, it's helpful as an independent
change.

> Index: mmotm-2.6.32-Nov2/fs/proc/task_mmu.c
> ===================================================================
> --- mmotm-2.6.32-Nov2.orig/fs/proc/task_mmu.c
> +++ mmotm-2.6.32-Nov2/fs/proc/task_mmu.c
> @@ -17,7 +17,7 @@
> void task_mem(struct seq_file *m, struct mm_struct *mm)
> {
> unsigned long data, text, lib;
> - unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
> + unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss, swap;
>
> /*
> * Note: to minimize their overhead, mm maintains hiwater_vm and
> @@ -36,6 +36,8 @@ void task_mem(struct seq_file *m, struct
> data = mm->total_vm - mm->shared_vm - mm->stack_vm;
> text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
> lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
> +
> + swap = get_mm_counter(mm, swap_usage);
> seq_printf(m,
> "VmPeak:\t%8lu kB\n"
> "VmSize:\t%8lu kB\n"

Not sure about this newline though.