On Tue, May 09, 2006 at 02:23:15PM +1000, Nick Piggin wrote:
> Balbir Singh wrote:
>
> >On Mon, May 08, 2006 at 02:19:52PM -0700, Andrew Morton wrote:
> >
> >>Balbir Singh <[email protected]> wrote:
> >>
> >>>@@ -550,6 +550,12 @@ struct task_delay_info {
> >>> * Atomicity of updates to XXX_delay, XXX_count protected by
> >>> * single lock above (split into XXX_lock if contention is an issue).
> >>> */
> >>>+
> >>>+ struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
> >>>+ u64 blkio_delay; /* wait for sync block io completion */
> >>>+ u64 swapin_delay; /* wait for swapin block io completion */
> >>>+ u32 blkio_count;
> >>>+ u32 swapin_count;
> >>>
> >>These fields are a bit mystifying.
> >>
> >>In what units are blkio_delay and swapin_delay?
> >>
> >>What is the meaning behind blkio_count and swapin_count?
> >>
> >>Better comments needed, please.
> >>
> >
> >Will add more detailed comments and send them as updates.
> >
>
> What kinds of usages will this stuff see? Will the CONFIG be usually
> turned on,
> with some tasks occasionally using the statistics?
>
> In which case, might it be better to make each delay collector in its
> own data
> structure { .list; .start; .end; .delay; .count; .private; .name }, and
> allocate
> them and hang them off the task structure when they're in use?
>
> Or even put them in their own data structure (a small hash or something).
>
> OTOH if they're often going to be in use by many tasks, then what you
> have might
> be the best option.
>
> Nick
>
> Send instant messages to your online friends http://au.messenger.yahoo.com
I expect/hope that the CONFIG will be turned on. There is a boot
option (called delayacct) to enable/disable the statistics collection.
Once turned on and enabled, all tasks will be filling in/using the statistics.
Thanks,
Balbir Singh,
Linux Technology Center,
IBM Software Labs
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