On Wed, Apr 07, 2021 at 07:00:33PM +0200, Peter Zijlstra wrote:
> On Thu, Apr 01, 2021 at 03:10:17PM +0200, Peter Zijlstra wrote:
>
> > Current hard-coded policies are:
> >
> > - a user can clear the cookie of any process they can set a cookie for.
> >Lack of a cookie *might* be a security
On Tue, Apr 06, 2021 at 10:16:12AM -0400, Tejun Heo wrote:
> Hello,
>
> On Mon, Apr 05, 2021 at 02:46:09PM -0400, Joel Fernandes wrote:
> > Yeah, its at http://lore.kernel.org/r/20200822030155.ga414...@google.com
> > as mentioned above, let me know if you need any more deta
Hi TJ, Peter,
On Sun, Apr 4, 2021 at 7:39 PM Tejun Heo wrote:
>
> cc'ing Michal and Christian who've been spending some time on cgroup
> interface issues recently and Li Zefan for cpuset.
>
> On Thu, Apr 01, 2021 at 03:10:12PM +0200, Peter Zijlstra wrote:
> > The cgroup interface now uses a
Signed-off-by: Joel Fernandes (Google)
---
.../admin-guide/hw-vuln/core-scheduling.rst | 460 ++
Documentation/admin-guide/hw-vuln/index.rst | 1 +
2 files changed, 461 insertions(+)
create mode 100644 Documentation/admin-guide/hw-vuln/core-scheduling.rst
diff --git
From: chris hyser
This patch provides support for setting, clearing and copying core
scheduling 'task cookies' between threads (PID), processes (TGID), and
process groups (PGID).
The value of core scheduling isn't that tasks don't share a core, 'nosmt'
can do that. The value lies in exploiting
Add a kselftest test to ensure that the core-sched interface is working
correctly.
Co-developed-by: Chris Hyser
Signed-off-by: Chris Hyser
Co-developed-by: Josh Don
Signed-off-by: Josh Don
Tested-by: Julien Desfossez
Signed-off-by: Joel Fernandes (Google)
Signed-off-by: chris hyser
Tested-by: Julien Desfossez
Not-Signed-off-by: Peter Zijlstra (Intel)
---
kernel/sched/core.c | 40 +++-
kernel/sched/fair.c | 12
2 files changed, 51 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index
From: Josh Don
This adds the API to set/get the cookie for a given cgroup. This
interface lives at cgroup/cpu.core_tag.
The cgroup interface can be used to toggle a unique cookie value for all
descendent tasks, preventing these tasks from sharing with any others.
See
the idlest CPU whose core
cookie matches with task's cookie
Signed-off-by: Aubrey Li
Signed-off-by: Tim Chen
Signed-off-by: Vineeth Remanan Pillai
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/fair.c | 29 ++
kernel/sched/sched.h | 73
.
Core scheduler has extra overhead. Enable it only for machines with
more than one SMT hardware thread.
Co-developed-by: Chris Hyser
Signed-off-by: Chris Hyser
Co-developed-by: Joel Fernandes (Google)
Signed-off-by: Joel Fernandes (Google)
Tested-by: Julien Desfossez
Signed-off-by: Julien
From: chris hyser
Provides a selftest and examples of using the interface.
Signed-off-by: Chris Hyser
Signed-off-by: Josh Don
---
tools/testing/selftests/sched/.gitignore | 1 +
tools/testing/selftests/sched/Makefile| 14 +
tools/testing/selftests/sched/config | 1
(1):
sched: migration changes for core scheduling
Joel Fernandes (Google) (3):
kselftest: Add tests for core-sched interface
Documentation: Add core scheduling documentation
sched: Debug bits...
Josh Don (2):
sched: core scheduling tagging infrastructure
sched: cgroup cookie API for core
On Sat, Mar 20, 2021 at 04:40:20PM +0100, Peter Zijlstra wrote:
> On Fri, Mar 19, 2021 at 04:32:47PM -0400, Joel Fernandes (Google) wrote:
> > Enclosed is interface related core scheduling patches and one for migration.
> > The main core scheduling patches were already pul
-by: Tim Chen
Signed-off-by: Vineeth Remanan Pillai
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/fair.c | 33 +---
kernel/sched/sched.h | 72
2 files changed, 101 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/fair.c b
with
more than one SMT hardware thread.
Co-developed-by: Chris Hyser
Signed-off-by: Chris Hyser
Co-developed-by: Joel Fernandes (Google)
Signed-off-by: Joel Fernandes (Google)
Tested-by: Julien Desfossez
Signed-off-by: Julien Desfossez
Signed-off-by: Tim Chen
Signed-off-by: Peter Zijlstra (Intel
From: chris hyser
This patch provides support for setting, clearing and copying core
scheduling 'task cookies' between threads (PID), processes (TGID), and
process groups (PGID).
The value of core scheduling isn't that tasks don't share a core, 'nosmt'
can do that. The value lies in exploiting
Add a kselftest test to ensure that the core-sched interface is working
correctly.
Co-developed-by: Chris Hyser
Signed-off-by: Chris Hyser
Co-developed-by: Josh Don
Signed-off-by: Josh Don
Tested-by: Julien Desfossez
Signed-off-by: Joel Fernandes (Google)
---
tools/testing/selftests/sched
Signed-off-by: Joel Fernandes (Google)
---
.../admin-guide/hw-vuln/core-scheduling.rst | 460 ++
Documentation/admin-guide/hw-vuln/index.rst | 1 +
2 files changed, 461 insertions(+)
create mode 100644 Documentation/admin-guide/hw-vuln/core-scheduling.rst
diff --git
Tested-by: Julien Desfossez
Not-Signed-off-by: Peter Zijlstra (Intel)
---
kernel/sched/core.c | 40 +++-
kernel/sched/fair.c | 9 +
2 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index
From: Joel Fernandes
Core-Scheduling
===
Enclosed is interface related core scheduling patches and one for migration.
The main core scheduling patches were already pulled in by Peter with these
bits left.
Main changes are the simplification of the core cookie scheme,
new prctl code
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 6bc335828056f3b301a3deadda782de4e8f0db08
Gitweb:
https://git.kernel.org/tip/6bc335828056f3b301a3deadda782de4e8f0db08
Author:Joel Fernandes (Google)
AuthorDate:Tue, 03 Nov 2020 09:25:57 -05:00
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: c2e13112e830c06825339cbadf0b3bc2bdb9a716
Gitweb:
https://git.kernel.org/tip/c2e13112e830c06825339cbadf0b3bc2bdb9a716
Author:Joel Fernandes (Google)
AuthorDate:Tue, 03 Nov 2020 09:26:03 -05:00
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: ae5c2341ed3987bd434ed495bd4f3d8b2bc3e623
Gitweb:
https://git.kernel.org/tip/ae5c2341ed3987bd434ed495bd4f3d8b2bc3e623
Author:Joel Fernandes (Google)
AuthorDate:Wed, 23 Sep 2020 11:22:09 -04:00
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: b4e6039e8af8c20dfbbdfcaebfcbd7c9d9ffe713
Gitweb:
https://git.kernel.org/tip/b4e6039e8af8c20dfbbdfcaebfcbd7c9d9ffe713
Author:Joel Fernandes (Google)
AuthorDate:Wed, 18 Nov 2020 11:15:41 -05:00
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 68804cf1c905ce227e4e1d0bc252c216811c59fd
Gitweb:
https://git.kernel.org/tip/68804cf1c905ce227e4e1d0bc252c216811c59fd
Author:Joel Fernandes (Google)
AuthorDate:Wed, 14 Oct 2020 18:21:53 -04:00
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 3afe7fa535491ecd0382c3968dc2349602bff8a2
Gitweb:
https://git.kernel.org/tip/3afe7fa535491ecd0382c3968dc2349602bff8a2
Author:Joel Fernandes (Google)
AuthorDate:Sat, 14 Nov 2020 14:31:32 -05:00
On Thu, Feb 04, 2021 at 03:52:53PM +0100, Peter Zijlstra wrote:
> On Fri, Jan 22, 2021 at 08:17:01PM -0500, Joel Fernandes (Google) wrote:
> > +static void sched_core_update_cookie(struct task_struct *p, unsigned long
> > cookie,
> > +enum s
Hi Peter,
On Thu, Feb 04, 2021 at 02:59:58PM +0100, Peter Zijlstra wrote:
> On Wed, Feb 03, 2021 at 05:51:15PM +0100, Peter Zijlstra wrote:
> >
> > I'm slowly starting to go through this...
> >
> > On Fri, Jan 22, 2021 at 08:17:01PM -0500, Joel Fernandes (Google
ooks correct to me, I will further review it
and await further reviews from others as well, and then backport the patch to
our kernels. Thanks Vince and everyone!
Tested-by: Joel Fernandes (Google)
thanks,
- Joel
> ---
> kernel/sched/fair.c | 32 +++-
> 1
On Fri, Jan 29, 2021 at 5:33 AM Vincent Guittot
wrote:
[...]
> > > > > So why is it a problem for you ? You are mentioning newly idle load
> > > > > balance so I assume that your root problem is the scheduling delay
> > > > > generated by the newly idle load balance which then calls
> > > > >
Hi Vincent,
On Thu, Jan 28, 2021 at 8:57 AM Vincent Guittot
wrote:
> > On Mon, Jan 25, 2021 at 03:42:41PM +0100, Vincent Guittot wrote:
> > > On Fri, 22 Jan 2021 at 20:10, Joel Fernandes
> > > wrote:
> > > > On Fri, Jan 22, 2021 at 05:56:22PM +0100, Vincent
Hi Vincent,
On Mon, Jan 25, 2021 at 03:42:41PM +0100, Vincent Guittot wrote:
> On Fri, 22 Jan 2021 at 20:10, Joel Fernandes wrote:
> > On Fri, Jan 22, 2021 at 05:56:22PM +0100, Vincent Guittot wrote:
> > > On Fri, 22 Jan 2021 at 16:46, Joel Fernandes (Go
for now that avoids
such complications.
Core scheduler has extra overhead. Enable it only for core with
more than one SMT hardware threads.
Co-developed-by: Josh Don
Co-developed-by: Chris Hyser
Co-developed-by: Joel Fernandes (Google)
Tested-by: Julien Desfossez
Signed-off-by: Tim Chen
Add a kselftest test to ensure that the core-sched interface is working
correctly.
Co-developed-by: Chris Hyser
Signed-off-by: Chris Hyser
Tested-by: Julien Desfossez
Reviewed-by: Josh Don
Signed-off-by: Josh Don
Signed-off-by: Chris Hyser
Signed-off-by: Joel Fernandes (Google)
---
tools
-by: Tim Chen
Signed-off-by: Vineeth Remanan Pillai
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/fair.c | 33 +---
kernel/sched/sched.h | 72
2 files changed, 101 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/fair.c b
Tested-by: Julien Desfossez
Not-Signed-off-by: Peter Zijlstra (Intel)
---
kernel/sched/core.c | 35 ++-
kernel/sched/fair.c | 9 +
2 files changed, 43 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index
Signed-off-by: Joel Fernandes (Google)
---
.../admin-guide/hw-vuln/core-scheduling.rst | 263 ++
Documentation/admin-guide/hw-vuln/index.rst | 1 +
2 files changed, 264 insertions(+)
create mode 100644 Documentation/admin-guide/hw-vuln/core-scheduling.rst
diff --git
changes for core scheduling
Joel Fernandes (Google) (3):
kselftest: Add tests for core-sched interface
Documentation: Add core scheduling documentation
sched: Debug bits...
Peter Zijlstra (1):
sched: CGroup tagging interface for core scheduling
.../admin-guide/hw-vuln/core-scheduling.rst | 263
On Fri, Jan 22, 2021 at 06:39:27PM +, Qais Yousef wrote:
> On 01/22/21 17:56, Vincent Guittot wrote:
> > > ---
> > > kernel/sched/fair.c | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > > index
Hi Vincent,
Thanks for reply. Please see the replies below:
On Fri, Jan 22, 2021 at 05:56:22PM +0100, Vincent Guittot wrote:
> On Fri, 22 Jan 2021 at 16:46, Joel Fernandes (Google)
> wrote:
> >
> > On an octacore ARM64 device running ChromeOS Linux kernel v5.4, I found
> &
)
*99.0th: 717 (7 samples)
99.5th: 725 (2 samples)
99.9th: 725 (0 samples)
Cc: Paul McKenney
Cc: Frederic Weisbecker
Suggested-by: Dietmar Eggeman
Co-developed-by: Qais Yousef
Signed-off-by: Qais Yousef
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/fair.c | 2
On Tue, Dec 01, 2020 at 11:21:37AM +1100, Balbir Singh wrote:
> On Tue, Nov 17, 2020 at 06:20:02PM -0500, Joel Fernandes (Google) wrote:
> > Tested-by: Julien Desfossez
> > Not-Signed-off-by: Peter Zijlstra (Intel)
> > ---
>
> May be put it under a #ifdef CO
Hi Marc, Quentin,
On Fri, Dec 11, 2020 at 4:34 AM Quentin Perret wrote:
>
> On Thursday 10 Dec 2020 at 08:45:22 (+), Marc Zyngier wrote:
> > On 2020-12-10 01:39, Joel Fernandes wrote:
> >
> > [...]
> >
> > > > Quentin and I have discussed potential
Hello Dhaval,
On Tue, Dec 15, 2020 at 1:14 PM Dhaval Giani wrote:
>
> On 12/14/20 3:25 PM, Joel Fernandes wrote:
>
> >> No problem. That was there primarily for debugging.
> > Ok. I squashed Josh's changes into this patch and several of my fixups. So
> > there'
On Mon, Dec 14, 2020 at 02:44:09PM -0500, chris hyser wrote:
> On 12/14/20 2:31 PM, Joel Fernandes wrote:
> > > diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
> > > index cffdfab..50c31f3 100644
> > > --- a/kernel/sched/debug.c
> > > +++ b/kernel
> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
> index cffdfab..50c31f3 100644
> --- a/kernel/sched/debug.c
> +++ b/kernel/sched/debug.c
> @@ -1030,6 +1030,7 @@ void proc_sched_show_task(struct task_struct *p, struct
> pid_namespace *ns,
>
> #ifdef CONFIG_SCHED_CORE
>
On Thu, Dec 10, 2020 at 10:37:37AM -0800, Paul E. McKenney wrote:
> Hello, Joel,
>
> In case you are -seriously- interested... ;-)
I am always seriously interested :-). The issue becomes when life throws me a
curveball. This was the year of curveballs :-)
Thank you for your reply and I have
On Mon, Dec 14, 2020 at 10:36:29AM +0100, Laurent Dufour wrote:
> Le 14/12/2020 à 03:03, Joel Fernandes a écrit :
> > On Tue, Jul 07, 2020 at 01:31:37PM +0800, Chinwen Chang wrote:
> > [..]
> > > > > Hi Laurent,
> > > > >
> > > > > We
On Tue, Jul 07, 2020 at 01:31:37PM +0800, Chinwen Chang wrote:
[..]
> > > Hi Laurent,
> > >
> > > We merged SPF v11 and some patches from v12 into our platforms. After
> > > several experiments, we observed SPF has obvious improvements on the
> > > launch time of applications, especially for
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 9f866dac94292f93d3b6bf8dbe860a44b954e555
Gitweb:
https://git.kernel.org/tip/9f866dac94292f93d3b6bf8dbe860a44b954e555
Author:Joel Fernandes (Google)
AuthorDate:Tue, 29 Sep 2020 15:29:27 -04:00
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: bd56e0a4a291bc9db2cbaddef20ec61a1aad4208
Gitweb:
https://git.kernel.org/tip/bd56e0a4a291bc9db2cbaddef20ec61a1aad4208
Author:Joel Fernandes (Google)
AuthorDate:Wed, 07 Oct 2020 13:50:36 -07:00
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: a043260740d5d6ec5be59c3fb595c719890a0b0b
Gitweb:
https://git.kernel.org/tip/a043260740d5d6ec5be59c3fb595c719890a0b0b
Author:Joel Fernandes (Google)
AuthorDate:Tue, 29 Sep 2020 15:29:28 -04:00
Hi Marc, nice to hear from you.
On Wed, Dec 9, 2020 at 4:43 AM Marc Zyngier wrote:
>
> Hi all,
>
> On 2020-12-08 20:02, Joel Fernandes wrote:
> > On Fri, Sep 11, 2020 at 4:58 AM Sergey Senozhatsky
> > wrote:
> >>
> >> My apologies for the slow reply.
&
On Fri, Sep 11, 2020 at 4:58 AM Sergey Senozhatsky
wrote:
>
> My apologies for the slow reply.
>
> On (20/08/17 13:25), Marc Zyngier wrote:
> >
> > It really isn't the same thing at all. You are exposing PV spinlocks,
> > while Sergey exposes preemption to vcpus.
> >
>
> Correct, we see vcpu
On Tue, Dec 01, 2020 at 08:20:50PM +0100, Peter Zijlstra wrote:
> On Tue, Dec 01, 2020 at 02:11:33PM -0500, Joel Fernandes wrote:
> > On Wed, Nov 25, 2020 at 12:15:41PM +0100, Peter Zijlstra wrote:
> > > On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernan
Hi Peter,
On Tue, Dec 01, 2020 at 08:34:51PM +0100, Peter Zijlstra wrote:
> On Tue, Dec 01, 2020 at 02:20:28PM -0500, Joel Fernandes wrote:
> > On Wed, Nov 25, 2020 at 12:10:14PM +0100, Peter Zijlstra wrote:
> > > On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernan
On Wed, Dec 02, 2020 at 04:47:17PM -0500, Chris Hyser wrote:
> On Tue, Nov 17, 2020 at 06:19:53PM -0500, Joel Fernandes (Google) wrote:
> > Add a per-thread core scheduling interface which allows a thread to share a
> > core with another thread, or have a core exclusi
On Tue, Dec 01, 2020 at 08:21:43PM -0800, Paul E. McKenney wrote:
> On Tue, Dec 01, 2020 at 05:26:32PM -0500, Joel Fernandes wrote:
> > On Thu, Nov 19, 2020 at 3:42 PM Joel Fernandes
> > wrote:
> > >
> > > On Thu, Nov 19, 2020 at 12:16:15PM -0800, Paul E. McKen
On Thu, Nov 19, 2020 at 3:42 PM Joel Fernandes wrote:
>
> On Thu, Nov 19, 2020 at 12:16:15PM -0800, Paul E. McKenney wrote:
> > On Thu, Nov 19, 2020 at 02:44:35PM -0500, Joel Fernandes wrote:
> > > On Thu, Nov 19, 2020 at 2:22 PM Paul E. McKenney
> > > wrote:
Hi Peter,
On Wed, Nov 25, 2020 at 02:42:37PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:56PM -0500, Joel Fernandes (Google) wrote:
> > From: Josh Don
> >
> > Google has a usecase where the first level tag to tag a CGroup is not
> > sufficient. So, a
On Wed, Nov 25, 2020 at 02:08:08PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:53PM -0500, Joel Fernandes (Google) wrote:
> > +/* Called from prctl interface: PR_SCHED_CORE_SHARE */
> > +int sched_core_share_pid(pid_t pid)
> > +{
> > + struct task_st
On Wed, Nov 25, 2020 at 12:10:14PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > +void sched_core_tag_requeue(struct task_struct *p, unsigned long cookie,
> > bool group)
> > +{
> > + if
On Wed, Nov 25, 2020 at 12:11:28PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
>
> > + * sched_core_tag_requeue - Common helper for all interfaces to set a
> > cookie.
>
> sched_core_set_cookie() woul
On Wed, Nov 25, 2020 at 12:15:41PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
>
> > +/*
> > + * Ensure that the task has been requeued. The stopper ensures that the
> > task cannot
> > + * be migrated to
On Wed, Nov 25, 2020 at 12:07:09PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > Also, for the per-task cookie, it will get weird if we use pointers of any
> > emphemeral objects. For this reason, introduce a refcount
On Wed, Nov 25, 2020 at 02:03:22PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > +static bool sched_core_get_task_cookie(unsigned long cookie)
> > +{
> > + struct sched_core_cookie *ptr = (struct sched
On Wed, Nov 25, 2020 at 01:54:47PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > +/* Per-task interface */
> > +static unsigned long sched_core_alloc_task_cookie(void)
> > +{
> > + st
On Wed, Nov 25, 2020 at 09:49:08AM +0100, Peter Zijlstra wrote:
> On Tue, Nov 24, 2020 at 01:03:43PM -0500, Joel Fernandes wrote:
> > On Tue, Nov 24, 2020 at 05:13:35PM +0100, Peter Zijlstra wrote:
> > > On Tue, Nov 17, 2020 at 06:19:49PM -0500, Joel Fernandes (Google) wrote:
On Wed, Nov 25, 2020 at 10:37:00AM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:48PM -0500, Joel Fernandes (Google) wrote:
> > Core-scheduling prevents hyperthreads in usermode from attacking each
> > other, but it does not do anything about one of the hyperthrea
On Thu, Nov 26, 2020 at 10:05:19AM +1100, Balbir Singh wrote:
> On Tue, Nov 24, 2020 at 01:30:38PM -0500, Joel Fernandes wrote:
> > On Mon, Nov 23, 2020 at 09:41:23AM +1100, Balbir Singh wrote:
> > > On Tue, Nov 17, 2020 at 06:19:40PM -0500, Joel Fernandes (Google) wrote:
&
On Mon, Nov 23, 2020 at 09:41:23AM +1100, Balbir Singh wrote:
> On Tue, Nov 17, 2020 at 06:19:40PM -0500, Joel Fernandes (Google) wrote:
> > From: Peter Zijlstra
> >
> > The rationale is as follows. In the core-wide pick logic, even if
> > need_sync == false, we ne
On Tue, Nov 24, 2020 at 05:13:35PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:49PM -0500, Joel Fernandes (Google) wrote:
> > Add a generic_idle_{enter,exit} helper function to enter and exit kernel
> > protection when entering and exiting idle, respectively.
Hi Peter,
On Tue, Nov 24, 2020 at 05:09:06PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:48PM -0500, Joel Fernandes (Google) wrote:
> > Core-scheduling prevents hyperthreads in usermode from attacking each
> > other, but it does not do anything about one of t
Hi Peter,
On Tue, Nov 24, 2020 at 11:27:41AM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:45PM -0500, Joel Fernandes (Google) wrote:
> > A previous patch improved cross-cpu vruntime comparison opertations in
> > pick_next_task(). Improve it further for t
Hi Peter,
On Tue, Nov 24, 2020 at 01:04:38PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:42PM -0500, Joel Fernandes (Google) wrote:
> > + /*
> > +* Optimize for common case where this CPU has no cookies
> > +* and there are no cookied task
On Tue, Nov 24, 2020 at 6:48 AM Vincent Guittot
wrote:
>
> Hi Joel,
>
> On Wed, 18 Nov 2020 at 00:20, Joel Fernandes (Google)
> wrote:
> >
> > Core-Scheduling
> > ===
> > Enclosed is series v9 of core scheduling.
> > v9 is rebased on tip/
On Fri, Nov 20, 2020 at 10:56:09AM +1100, Singh, Balbir wrote:
[..]
> > +#ifdef CONFIG_SMP
> > +static struct task_struct *pick_task_fair(struct rq *rq)
> > +{
> > + struct cfs_rq *cfs_rq = >cfs;
> > + struct sched_entity *se;
> > +
> > + if (!cfs_rq->nr_running)
> > + return
On Fri, Nov 20, 2020 at 10:31:39AM +1100, Singh, Balbir wrote:
> On 18/11/20 10:19 am, Joel Fernandes (Google) wrote:
> > From: Peter Zijlstra
> >
> > In preparation of playing games with rq->lock, abstract the thing
> > using an accessor.
> >
>
On Thu, Nov 19, 2020 at 12:16:15PM -0800, Paul E. McKenney wrote:
> On Thu, Nov 19, 2020 at 02:44:35PM -0500, Joel Fernandes wrote:
> > On Thu, Nov 19, 2020 at 2:22 PM Paul E. McKenney wrote:
> > > > > > > On Wed, Nov 18, 2020 at 11:15:41AM -0500, Joel Fernandes
On Thu, Nov 19, 2020 at 2:22 PM Paul E. McKenney wrote:
> > > > > On Wed, Nov 18, 2020 at 11:15:41AM -0500, Joel Fernandes (Google)
> > > > > wrote:
> > > > > > After rcu_do_batch(), add a check for whether the seglen counts
> > > &g
On Wed, Nov 18, 2020 at 07:56:13PM -0800, Paul E. McKenney wrote:
> On Wed, Nov 18, 2020 at 07:52:23PM -0800, Paul E. McKenney wrote:
> > On Wed, Nov 18, 2020 at 12:13:35PM -0800, Paul E. McKenney wrote:
> > > On Wed, Nov 18, 2020 at 11:15:41AM -0500, Joel Fernandes (Google) wr
After rcu_do_batch(), add a check for whether the seglen counts went to
zero if the list was indeed empty.
Signed-off-by: Joel Fernandes (Google)
---
v1->v2: Added more debug checks.
kernel/rcu/rcu_segcblist.c | 12
kernel/rcu/rcu_segcblist.h | 3 +++
kernel/rcu/tre
After rcu_do_batch(), add a check for whether the seglen counts went to
zero if the list was indeed empty.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/rcu_segcblist.c | 12
kernel/rcu/rcu_segcblist.h | 3 +++
kernel/rcu/tree.c | 1 +
3 files changed, 16
-off-by: Joel Fernandes (Google)
---
kernel/sched/core.c | 33 -
kernel/sched/fair.c | 40
kernel/sched/sched.h | 5 +
3 files changed, 65 insertions(+), 13 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched
to schedule.
Tested-by: Julien Desfossez
Reviewed-by: Joel Fernandes (Google)
Signed-off-by: Vineeth Pillai
Signed-off-by: Julien Desfossez
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/core.c | 15 ---
kernel/sched/fair.c | 40
Pillai
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/core.c | 183 +--
kernel/sched/sched.h | 4 +
2 files changed, 181 insertions(+), 6 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7f807a84cc30..b99a7493d590
.
Reviewed-by: Vineeth Pillai
Suggested-by: Peter Zijlstra (Intel)
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/core.c | 61 +
kernel/sched/fair.c | 80
kernel/sched/sched.h | 7 +++-
3 files changed, 97
Add a generic_idle_{enter,exit} helper function to enter and exit kernel
protection when entering and exiting idle, respectively.
While at it, remove a stale RCU comment.
Reviewed-by: Alexandre Chartre
Tested-by: Julien Desfossez
Signed-off-by: Joel Fernandes (Google)
---
include/linux/entry
Tested-by: Julien Desfossez
Not-Signed-off-by: Peter Zijlstra (Intel)
---
kernel/sched/core.c | 35 ++-
kernel/sched/fair.c | 9 +
2 files changed, 43 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index
defaults to
'secure' and can be overridden to 'on' if the user wants to enable
coresched even if the HW is not vulnerable. 'off' would disable
core scheduling in any case.
Also add a sched_debug entry to indicate if core scheduling is turned on
or not.
Reviewed-by: Alexander Graf
Signed-off-by: Joel
Document the usecases, design and interfaces for core scheduling.
Co-developed-by: Vineeth Pillai
Signed-off-by: Vineeth Pillai
Tested-by: Julien Desfossez
Reviewed-by: Randy Dunlap
Signed-off-by: Joel Fernandes (Google)
---
.../admin-guide/hw-vuln/core-scheduling.rst | 330
Desfossez
Signed-off-by: Peter Zijlstra (Intel)
Signed-off-by: Joel Fernandes (Google)
---
include/linux/sched.h | 1 +
kernel/sched/core.c | 130 +-
kernel/sched/idle.c | 1 +
kernel/sched/sched.h | 6 ++
4 files changed, 137 insertions(+), 1
-by: Julien Desfossez
Reviewed-by: Chris Hyser
Signed-off-by: Chris Hyser
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/Makefile | 1 +
kernel/sched/core.c| 809 +---
kernel/sched/coretag.c | 819 +
kernel
ime.
Suggested-by: Vineeth Remanan Pillai
Signed-off-by: Peter Zijlstra
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/fair.c | 11 +++
1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 12cf068eeec8..51483a00a755 100
.
Reviewed-by: Joel Fernandes (Google)
Signed-off-by: Josh Don
Signed-off-by: Joel Fernandes (Google)
---
include/linux/sched.h | 1 +
kernel/sched/core.c | 120 +++---
kernel/sched/sched.h | 2 +
3 files changed, 103 insertions(+), 20 deletions(-)
diff
Add a kselftest test to ensure that the core-sched interface is working
correctly.
Tested-by: Julien Desfossez
Reviewed-by: Josh Don
Signed-off-by: Joel Fernandes (Google)
---
tools/testing/selftests/sched/.gitignore | 1 +
tools/testing/selftests/sched/Makefile| 14 +
tools
This will be used by kselftest to verify the CGroup cookie value that is
set by the CGroup interface.
Reviewed-by: Josh Don
Tested-by: Julien Desfossez
Signed-off-by: Joel Fernandes (Google)
---
kernel/sched/core.c | 31 +++
1 file changed, 31 insertions(+)
diff
of existing core cookies so that multiple
tasks may share the same core_cookie.
This will be especially useful in the next patch, where the concept of
cookie color is introduced.
Reviewed-by: Joel Fernandes (Google)
Signed-off-by: Josh Don
Signed-off-by: Joel Fernandes (Google)
---
kernel
the camera streaming frame rate by ~3%.
Tested-by: Julien Desfossez
Reviewed-by: Aubrey Li
Co-developed-by: Chris Hyser
Signed-off-by: Chris Hyser
Signed-off-by: Joel Fernandes (Google)
---
include/linux/sched.h| 1 +
include/uapi/linux/prctl.h | 3 ++
kernel/sched/core.c
During exit, we have to free the references to a cookie that might be shared by
many tasks. This commit therefore ensures when the task_struct is released, any
references to cookies that it holds are also released.
Reviewed-by: Chris Hyser
Tested-by: Julien Desfossez
Signed-off-by: Joel
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