Re: [Lse-tech] Re: [PATCH] new CSA patchset for 2.6.8

[Jay Lan]

Adding csa@xxxxxxxxxxx, the CSA user group mailing list, to Cc.

Tim Schmielau wrote:
> On Mon, 30 Aug 2004, Guillaume Thouvenin wrote:
>
>
> >  Thus, to be clear, the enhanced accounting can be divided into
> > three parts:
> >
> >    1) A common data collection method in the kernel.
> >       We could start from BSD-accounting and add CSA information. Could
> >       it be something like BSD version4?
>
>
> I've had a quick look at the CSA data collection patches. To get the 
> discussion started, here are my comments:
>
>
> > --- linux.orig/drivers/block/ll_rw_blk.c        2004-08-13 22:36:16.000000000 -0700
> > +++ linux/drivers/block/ll_rw_blk.c     2004-08-18 12:07:10.000000000 -0700
> > @@ -1948,10 +1950,12 @@
> >
> >        if (rw == READ) {
> >                disk_stat_add(rq->rq_disk, read_sectors, nr_sectors);
> > +               current->rblk += nr_sectors;
> >                if (!new_io)
> >                        disk_stat_inc(rq->rq_disk, read_merges);
> >        } else if (rw == WRITE) {
> >                disk_stat_add(rq->rq_disk, write_sectors, nr_sectors);
> > +               current->wblk += nr_sectors;
> >                if (!new_io)
> >                        disk_stat_inc(rq->rq_disk, write_merges);
> >        }
>
>
> Andi Kleen's comment on the ELSA patch also applies here - most writes
> will get accounted to pdflushd. See
>
> http://www.lib.uaa.alaska.edu/linux-kernel/archive/2004-Week-31/0047.html
>
> for his comment.

I need more time on this. :)

> > --- /dev/null   1970-01-01 00:00:00.000000000 +0000
> > +++ linux/include/linux/csa_internal.h  2004-08-19 15:19:05.000000000 -0700
>
> [...]
>
> > +#else  /* CONFIG_CSA || CONFIG_CSA_MODULE */
> > +
> > +#define csa_update_integrals()         do { } while (0);
> > +#define csa_clear_integrals(task)      do { } while (0);
> > +#endif /* CONFIG_CSA || CONFIG_CSA_MODULE */
>
>
> I suppose the semicolons are unintentional.

Good catch! I fixed this in our internal tree.

> > --- linux.orig/include/linux/sched.h    2004-08-19 15:17:52.000000000 -0700
> > +++ linux/include/linux/sched.h 2004-08-19 15:19:05.000000000 -0700
>
> [...]
>
> > @@ -525,6 +527,10 @@
> >
> > /* i/o counters(bytes read/written, blocks read/written, #syscalls, waittime */
> >         unsigned long rchar, wchar, rblk, wblk, syscr, syscw, bwtime;
> > +#if defined(CONFIG_CSA) || defined(CONFIG_CSA_MODULE)
> > +       unsigned long csa_rss_mem1, csa_vm_mem1;
> > +       clock_t csa_stimexpd;
> > +#endif
>
>
> These probably need to be u64, otherwise they might easily overflow within
> a view seconds on 32 bit platforms.

Will fix it.

> > --- /dev/null   1970-01-01 00:00:00.000000000 +0000
> > +++ linux/include/linux/acct_eop.h      2004-08-19 18:48:44.000000000 -0700
>
>
> This should probably be unified with BSD accounting to a general accounting
> hook.

Do you suggest to merge acct_eop.h into acct.h? It sounds good to me!

Thanks!
 - jay

> Tim
>
>
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