Re: [LTP] [PATCH] proc01: add option to limit max read bytes

[Jan S. <jst...@re...>]

----- Original Message -----
> From: ch...@su...
> To: "Jan Stancek" <jst...@re...>
> Cc: ltp...@li...
> Sent: Tuesday, 16 February, 2010 3:27:19 AM
> Subject: Re: [LTP] [PATCH] proc01: add option to limit max read bytes
> 
> Hi!
> > single proc file. When this limit is reached testcase
> > will continue with next file.
> > 
> > Reason for this new option is to allow running this testcase
> > as sanity test, that doesn't need go through full content of
> > files such as "pagemap" (which can take hours).
> 
> Wouldn't adding -m to the proc01 to runtest/fs make sense too?

Seems like a good idea. Question is, what should we choose
as good default for maximum. I'm running it now with:
proc01 proc01 -m 128

I chose 128MB as rule of thumb, so I can hit some real pages
and holes (in pagemap). 128MB equals to 4194304 pages (32bits per entry).
If page_size is 4kB, this covers first 16G of address space, so
it's likely you hit all kinds of pagemap entries.

Regards,
Jan

> 
> (so we doesn't spend too much time in proc01 in defalt runs)
> 
> --
> Cyril Hrubis
> ch...@su...
>