Hi everyone,
On Fri, Aug 02, 2013 at 02:46:59PM -0500, Alex Thorlton wrote:
> This patch implements functionality to allow processes to disable the use of
> transparent hugepages through the prctl syscall.
>
> We've determined that some jobs perform significantly better with thp
> disabled,
> an
> This 321.equake_l thing is not public, right? Do you have anything
> that
> is public that shows the same problem?
The quake test comes from the SPEC OMP benchmarks. While I believe this
suite is available to anybody, I don't think it's free. I was given
the test by our benchmarking team, I'll
On Fri, Aug 16, 2013 at 09:33:56AM -0500, Alex Thorlton wrote:
> This first set of tests was run on the latest community kernel, with the
> vclear patches:
>
> Kernel string: Kernel 3.11.0-rc5-medusa-00021-g1a15a96-dirty
> harp31-sys:/home/estes04/athorlton/Testing/progs/thp_benchmarks/321.equake
Here are the results from one of the benchmarks that performs
particularly poorly when thp is enabled. Unfortunately the vclear
patches don't seem to provide a performance boost. I've attached
the patches that include the changes I had to make to get the vclear
patches applied to the latest kerne
> Please try it with the vclear patches.
Thanks, Andi. I'll give that a shot and see if it makes any difference.
- Alex
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Alex Thorlton writes:
>> What kind of workloads are you talking about?
>
> Our benchmarking team has a list of several of the SPEC OMP benchmarks
> that perform significantly better when THP is disabled. I tried to get
> the list but one of our servers is acting up and I can't get to it
> right n
Alex Thorlton writes:
> This patch implements functionality to allow processes to disable the use of
> transparent hugepages through the prctl syscall.
A few comments:
Is there a reason it shouldn't be possible for a process to un-disable/reenable
thp?
> +static inline int transparent_hugep
On 08/03, Kees Cook wrote:
>
> On Fri, Aug 2, 2013 at 1:34 PM, Alex Thorlton wrote:
> >
> >> And I think thp_disabled should be reset to 0 on exec.
> >
> > The main purpose for this getting carried down from the parent process
> > is that we'd like to be able to have a userland program set this fl
On Fri, Aug 2, 2013 at 1:34 PM, Alex Thorlton wrote:
>> What kind of workloads are you talking about?
>
> Our benchmarking team has a list of several of the SPEC OMP benchmarks
> that perform significantly better when THP is disabled. I tried to get
> the list but one of our servers is acting up a
Alex Thorlton wrote:
> > What kind of workloads are you talking about?
>
> Our benchmarking team has a list of several of the SPEC OMP benchmarks
> that perform significantly better when THP is disabled. I tried to get
> the list but one of our servers is acting up and I can't get to it
> right no
> What kind of workloads are you talking about?
Our benchmarking team has a list of several of the SPEC OMP benchmarks
that perform significantly better when THP is disabled. I tried to get
the list but one of our servers is acting up and I can't get to it
right now :/
> What's wrong with madvise
Alex Thorlton wrote:
> This patch implements functionality to allow processes to disable the use of
> transparent hugepages through the prctl syscall.
>
> We've determined that some jobs perform significantly better with thp
> disabled,
> and we need a way to control thp on a per-process basis, w
> Instead of blowing a whole int on this bool, we could add it
> to the bitfield a few pages up where we have other prctl things like..
>
> unsigned no_new_privs:1;
Definitely a better way to go. I'll tweak that and float another
version of the patch. Thanks for the input, Dave!
--
To uns
On Fri, Aug 02, 2013 at 02:46:59PM -0500, Alex Thorlton wrote:
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 50d04b9..f084c76 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1406,6 +1406,9 @@ struct task_struct {
> unsigned intsequenti
This patch implements functionality to allow processes to disable the use of
transparent hugepages through the prctl syscall.
We've determined that some jobs perform significantly better with thp disabled,
and we need a way to control thp on a per-process basis, without relying on
madvise.
---
i
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