Re: [RFC] VM statistics to gather

[Marcelo Tosatti <marcelo@conectiva.com.br>]

On Mon, 25 Jun 2001, Rik van Riel wrote:

> Hi,
> 
> I am starting the process of adding more detailed instrumentation
> to the VM subsystem and am wondering which statistics to add.
> A quick start of things to measure are below, but I've probably
> missed some things. Comments are welcome ...
> 
> 
> 
> --- kernel_stat.h.instr	Sun Jun 24 19:52:34 2001
> +++ kernel_stat.h	Mon Jun 25 20:02:38 2001
> @@ -26,6 +26,25 @@
>  	unsigned int dk_drive_wblk[DK_MAX_MAJOR][DK_MAX_DISK];
>  	unsigned int pgpgin, pgpgout;
>  	unsigned int pswpin, pswpout;
> +	unsigned int vm_pgscan;		/* Pages scanned by pageout code. */
> +	unsigned int vm_pgdeact;	/* Pages deactivated by pageout code */

s/page out code/deactivation code/ ?

+      unsigned int vm_swapout_pgdeact; /* Pages deactivated directly by
					  swapout() */

> +	unsigned int vm_pgclean;	/* Pages moved to inactive_clean */
> +	unsigned int vm_pgskiplaunder;	/* Pages skipped by page_launder */
> +	unsigned int vm_pglaundered;	/* Pages laundered by page_launder */
> +	unsigned int vm_pgreact;	/* Pages reactivated by page_launder
> +					 * (rescued from inactive_clean list) */

The "(rescued from inactive_clean list)" affirmation is not always true.

> +	unsigned int vm_pgrescue;	/* Pages reactivated by reclaim_page
> +					 * (rescued from inactive_dirty list) */
  	unsigned int vm_reclaimfail;	/* page_reclaim() failures (not able
					   to find any freeable page at 
					   inactive clean */
					
> +	unsigned int vm_majfault;	/* Major page faults (disk IO) */
> +	unsigned int vm_minfault;	/* Minor page faults (no disk IO) */
> +	unsigned int vm_cow_fault;	/* COW faults, copy needed */
> +	unsigned int vm_cow_optim;	/* COW skipped copy */
> +	unsigned int vm_zero_fault;	/* Zero-filled page given to process */
> +	unsigned int vm_zero_optim;	/* COW of the EMPTY_ZERO_PAGE */
> +	unsigned int vm_kswapd_wakeup;	/* kswapd wake-ups */
> +	unsigned int vm_kswapd_loops;	/* kswapd go-arounds in kswapd() loop */
	unsigned int vm_kreclaim_wakeup; /* kreclaimd wakeups */

> +	unsigned int vm_pg_freed;	/* Pages freed by pageout code, also
> +					   pages moved to inactive_clean */
>  #if !defined(CONFIG_ARCH_S390)
>  	unsigned int irqs[NR_CPUS][NR_IRQS];
>  #endif

Maybe I remember something more later..

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