Re: [kernel oops when locking the cluster using HAS]

[dipankar das <dipankar_dd@yahoo.com>]

--- KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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
> <kamezawa.hiroyu@jp.fujitsu.com>
> 
> 
> 
> ---
> 
> 
>
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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