--- KAMEZAWA Hiroyuki <[email protected]>
wrote:
> Hi,
>
> This is a updated version of a patch for counting
> bouce buffer page.
> A major change is :
> /proc/vmstat is used to show usage.
>
> Thanks
> -- Kame
> >
> This is a patch for counting the number of pages for
> bounce buffer.
> It's shown in /proc/vmstat.
>
> Currently, the number of bounce pages are not
> counted anywhere.
> So, if there are many bounce pages, it seems that
> there are
> leaked pages. And it's difficult for a user to
> imagine the usage of
> bounce pages. So, it's meaningful to show # of bouce
> pages.
>
> Signed-off-by: KAMEZAWA Hiroyuki
> <[email protected]>
>
>
>
> ---
>
>
>
linux-2.6.12-rc2-mm3-kamezawa/include/linux/page-flags.h
> | 1 +
> linux-2.6.12-rc2-mm3-kamezawa/mm/highmem.c
> | 2 ++
> linux-2.6.12-rc2-mm3-kamezawa/mm/page_alloc.c
> | 1 +
> 3 files changed, 4 insertions(+)
>
> diff -puN mm/highmem.c~count_bounce mm/highmem.c
> --- linux-2.6.12-rc2-mm3/mm/highmem.c~count_bounce
> 2005-04-25 12:04:28.000000000 +0900
> +++ linux-2.6.12-rc2-mm3-kamezawa/mm/highmem.c
> 2005-04-27 10:25:51.000000000 +0900
> @@ -325,6 +325,7 @@ static void bounce_end_io(struct
> bio *bi
> continue;
>
> mempool_free(bvec->bv_page, pool);
> + dec_page_state(nr_bounce);
> }
>
> bio_endio(bio_orig, bio_orig->bi_size, err);
> @@ -405,6 +406,7 @@ static void
> __blk_queue_bounce(request_q
> to->bv_page = mempool_alloc(pool, q->bounce_gfp);
> to->bv_len = from->bv_len;
> to->bv_offset = from->bv_offset;
> + inc_page_state(nr_bounce);
>
> if (rw == WRITE) {
> char *vto, *vfrom;
> diff -puN mm/page_alloc.c~count_bounce
> mm/page_alloc.c
> ---
> linux-2.6.12-rc2-mm3/mm/page_alloc.c~count_bounce
> 2005-04-27 10:15:39.000000000 +0900
> +++ linux-2.6.12-rc2-mm3-kamezawa/mm/page_alloc.c
> 2005-04-27 10:17:18.000000000 +0900
> @@ -1902,6 +1902,7 @@ static char *vmstat_text[] = {
> "nr_page_table_pages",
> "nr_mapped",
> "nr_slab",
> + "nr_bounce",
>
> "pgpgin",
> "pgpgout",
> diff -puN include/linux/page-flags.h~count_bounce
> include/linux/page-flags.h
> ---
>
linux-2.6.12-rc2-mm3/include/linux/page-flags.h~count_bounce
> 2005-04-27 10:23:15.000000000 +0900
> +++
>
linux-2.6.12-rc2-mm3-kamezawa/include/linux/page-flags.h
> 2005-04-27 10:24:11.000000000 +0900
> @@ -89,6 +89,7 @@ struct page_state {
> unsigned long nr_page_table_pages;/* Pages used
> for pagetables */
> unsigned long nr_mapped; /* mapped into pagetables
> */
> unsigned long nr_slab; /* In slab */
> + unsigned long nr_bounce; /* pages for bounce
> buffers */
> #define GET_PAGE_STATE_LAST nr_slab
>
> /*
>
> _
>
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