lkml.org 
[lkml]   [2003]   [Feb]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Performance of partial object-based rmap
> The performance delta between 2.5.62-mjb1 and 2.5.62-mjb2 is caused
> by the partial object-based rmap patch (written by Dave McCracken).
> I expect this patch to have an increasing impact on workloads with
> more processes, and it should give a substantial space saving as
> well as a performance increase. Results from 16x NUMA-Q system ...
>
> Profile comparison:
>
> before
> 15525 page_remove_rmap
> 6415 page_add_rmap
>
> after
> 2055 page_add_rmap
> 1983 page_remove_rmap

Did some space consumption comparisons on make -j 256:

before:
24116 pte_chain objects in slab cache
after:
716 pte_chain objects in slab cache

The vast majority of anonymous pages (for which we're using the non
object based method) are singletons, and hence use pte_direct ...
hence the massive space reduction.

M.

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

\
 
 \ /
  Last update: 2005-03-22 13:33    [W:0.045 / U:1.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site