On Sun, 16 October 2005 01:47:31 +0800, WU Fengguang wrote:
>
> @@ -131,6 +133,63 @@ struct page_state {
>
> unsigned long pgrotated; /* pages rotated to tail of the LRU */
> unsigned long nr_bounce; /* pages for bounce buffers */
> +
> + unsigned long cache_miss; /* read cache misses */
> + unsigned long readrandom; /* random reads */
> + unsigned long pgreadrandom; /* random read pages */
> + unsigned long readahead_rescue; /* read-aheads rescued*/
> + unsigned long pgreadahead_rescue;
> + unsigned long readahead_end; /* read-aheads passed EOF */
> +
> + unsigned long readahead; /* read-aheads issued */
> + unsigned long readahead_return; /* look-ahead marks returned */
> + unsigned long readahead_eof; /* read-aheads stop at EOF */
> + unsigned long pgreadahead; /* read-ahead pages issued */
> + unsigned long pgreadahead_hit; /* read-ahead pages accessed */
> + unsigned long pgreadahead_eof;
> +
> + unsigned long ra_newfile; /* read-ahead on start of file */
> + unsigned long ra_newfile_return;
> + unsigned long ra_newfile_eof;
> + unsigned long pgra_newfile;
> + unsigned long pgra_newfile_hit;
> + unsigned long pgra_newfile_eof;
> +
> + unsigned long ra_state; /* state based read-ahead */
> + unsigned long ra_state_return;
> + unsigned long ra_state_eof;
> + unsigned long pgra_state;
> + unsigned long pgra_state_hit;
> + unsigned long pgra_state_eof;
> +
> + unsigned long ra_context; /* context based read-ahead */
> + unsigned long ra_context_return;
> + unsigned long ra_context_eof;
> + unsigned long pgra_context;
> + unsigned long pgra_context_hit;
> + unsigned long pgra_context_eof;
> +
> + unsigned long ra_contexta; /* accelerated context based read-ahead */
> + unsigned long ra_contexta_return;
> + unsigned long ra_contexta_eof;
> + unsigned long pgra_contexta;
> + unsigned long pgra_contexta_hit;
> + unsigned long pgra_contexta_eof;
> +
> + unsigned long ra_backward; /* prefetch pages for backward reading */
> + unsigned long ra_backward_return;
> + unsigned long ra_backward_eof;
> + unsigned long pgra_backward;
> + unsigned long pgra_backward_hit;
> + unsigned long pgra_backward_eof;
> +
> + unsigned long ra_random; /* read-ahead on seek-and-read-pages */
> + unsigned long ra_random_return;
> + unsigned long ra_random_eof;
> + unsigned long pgra_random;
> + unsigned long pgra_random_hit;
> + unsigned long pgra_random_eof;
> +
> };
Without actually understanding what you're doing, wouldn't a struct
for all those groups make sense? I bet it can simplify the actual
code as well.
Jörn
--
When people work hard for you for a pat on the back, you've got
to give them that pat.
-- Robert Heinlein
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