Re: [resent PATCH] Re: very slow parallel read performance

Daniel Phillips
2001-08-26T23:17:56Z

On August 27, 2001 12:33 am, Russell King wrote:
> Of the 8192 pages in his system, there are 4687 anonymous pages like the
> above, 466 slab pages, 636 reserved pages, 376 unused pages (for reserved
> allocation) and 2000 ramdisk pages. That leaves 27 pages, which are the
> 26 inactive clean pages (from the above), plus one page cache page.
>
> Feel free to use this information to formulate new strategies on improving
> the VM.
>
> [note that it takes around 1 minute to get 32MB-worth of information out
> of a serial console at 38400 baud. You don't want to do this on GB boxes].

This is a nice dump format. One thing that would be very helpful is the page
executable flag, another would be the writable flag. The 4687 anonymous
pages are the elephant under the rug, but we don't know how they break down
between executable (evictable) and otherwise.

--
Daniel