lkml.org 
[lkml]   [2009]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen
    On Wed, May 20, 2009 at 07:20:24PM +0800, Andi Kleen wrote:
    > Wu Fengguang <fengguang.wu@intel.com> writes:
    > >
    > > 2.6.30-rc4-mm, VM_EXEC protection ON
    > > ------------------------------------
    > > begin: 2444 6652 50021 207 0 619959
    > > end: 284 231752 233394 210 773879 20890132
    > > restore: 399 231973 234352 251 776879 20960568
    > >
    > > We can reach basically the same conclusion from the above data.
    >
    > One scenario that might be useful to test is what happens when some
    > very large processes, all mapped and executable exceed memory and

    Good idea. Too bad I may have to install some bloated desktop in order
    to test this out ;) I guess the pgmajfault+pswpin numbers can serve as
    negative scores in that case?

    > fight each other for the working set. Do you have regressions then
    > compared to without the patches?

    No regressions for the above test. IMHO it can hardly create
    regressions if there are no one to aggressively abuse it. Rik and
    Christoph's ratio based logics are more likely to achieve better
    protections as well as regressions.

    Thanks,
    Fengguang


    \
     
     \ /
      Last update: 2009-05-20 16:37    [W:3.809 / U:0.188 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site