Re: [PATCH 2/3] vmscan: make mapped executable pages the firstclass citizen

[Wu Fengguang]

On Tue, May 19, 2009 at 01:09:32PM +0800, Wu Fengguang wrote:
> On Tue, May 19, 2009 at 12:41:38PM +0800, KOSAKI Motohiro wrote:

> Note that I was creating the sparse file in btrfs, which happens to be
> very slow in sparse file reading:
> 
>         151.194384MB/s 284.198252s 100001x 450560b --load pattern-hot-10 --play /b/sparse
> 
> In that case, the inactive list is rotated at the speed of 250MB/s,
> so a full scan of which takes about 3.5 seconds, while a full scan
> of active file list takes about 77 seconds.

Hi KOSAKI: you can limit the read speed with iotrace.rb's
"--think-time" option, or to read the sparse file over network.

Thanks,
Fengguang
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/