is alerting the
subsystem that the association changed during a fork.
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because it has either weird side effects
(b) or is just an odd feature (a).
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Hi Tejun,
You can charge the parent's at can_attach(), remember which one you
charged, and at post_fork() if the parent's has changed inbetween, fix
it up. [...]
Did you mean can_fork() instead of can_attach() here?
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inside a cgroup without hitting any reasonable kmemcg
policy. Once you've hit PID exhaustion, you're only in a marginally
better state than OOM. This subsystem allows PID exhaustion inside a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h
it to the right hierarchy using the
reapply_fork callback. Since a changing current css_set in
copy_process indicates an organisation operation took place, we can
break the cgroup policy in this case.
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp
Add a new macro for_each_subsys_which that allows all enabled cgroup
subsystems to be filtered by a bitmask, such that mask (1 ssid)
determines if the subsystem is to be processed in the loop body (where
ssid is the unique id of the subsystem).
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
hit PID exhaustion, you're only in a marginally
better state than OOM. This subsystem allows PID exhaustion inside a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h | 4 +
init/Kconfig | 11 ++
kernel/Makefile
an opaque pointer between cgroup_*_fork(), which holds the
current task css_set. The css_set is pinned by bumping the refcount
in cgroup_can_fork() and later unpinned in
cgroup_{cancel,post}_fork().
* A whole bunch of userland API and stylistic fixes.
Aleksa Sarai (3):
cgroups: use
Hello Tejun,
On Wed, Mar 11, 2015 at 2:17 AM, Tejun Heo t...@kernel.org wrote:
On Wed, Mar 11, 2015 at 01:51:06AM +1100, Aleksa Sarai wrote:
Actually, I'm fairly sure we can do it all inside cgroup_post_fork() because
inside cgroup_post_fork() we have access to both the old css_set and the new
the charge to the
hierarchies.
I'll send a patch in a few days, I need to make sure that this method
*actually* works. :P
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More
/2015/3/4/1198
Aleksa Sarai (2):
cgroups: allow a cgroup subsystem to reject a fork
cgroups: add a pids subsystem
include/linux/cgroup.h| 9 ++
include/linux/cgroup_subsys.h | 4 +
init/Kconfig | 11 ++
kernel/Makefile | 1 +
kernel/cgroup.c
it belongs).
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h | 9 ++
kernel/cgroup.c| 82 --
kernel/fork.c | 12 +++-
3 files changed
and the pids
cgroup controller are orthogonal features, why should they be able to affect
each other (or even be aware of each other)?
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More
a certain `css` (unless we start
passing `css_set`s to the fork/exit callbacks -- and then we can uncharge the
old css_set and charge the new one).
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actually get per-cgroup process limiting merged
first, then deal with such features separately.
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a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h | 4 +
init/Kconfig | 16 +++
kernel/Makefile | 1 +
kernel/cgroup_pids.c | 310 ++
4 files changed, 331
Replace the explicit checking against ss_masks inside a for_each_subsys
block with for_each_subsys_which(ss_mask, ...), to take advantage of the
more readable macro.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 42 ++
1 file changed
to be enforced prematurely due to residual charges on the pid
counter. This is done by adding a detach() callback that alerts a
subsystem to a task detaching from it.
[1]: https://lkml.org/lkml/2015/3/14/2
Aleksa Sarai (4):
cgroups: use bitmask to filter for_each_subsys
cgroups: replace
Add a new macro for_each_subsys_which that allows all enabled cgroup
subsystems to be filtered by a bitmask, such that mask (1 ssid)
determines if the subsystem is to be processed in the loop body (where
ssid is the unique id of the subsystem).
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
for no good reason).
If you *really* want the other one, I can send it.
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to another hierarchy, add a detach callback
to the subsystem which is run after the migration has been confirmed but
before the old_cset's refcount is dropped.
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h
://lkml.org/lkml/2015/3/31/1058
Aleksa Sarai (4):
cgroups: use bitmask to filter for_each_subsys
cgroups: replace explicit ss_mask checking with for_each_subsys_which
cgroups: allow a cgroup subsystem to reject a fork
cgroups: implement the PIDs subsystem
include/linux/cgroup.h| 35
subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h | 35 +++--
kernel/cgroup.c | 133
kernel/cgroup_freezer.c | 2 +-
kernel/fork.c | 31 +--
kernel/sched/core.c | 2 +-
5
separate bitmasks for
each callback to make (ss-{fork,exit}) checks unnecessary.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 43 ++-
1 file changed, 26 insertions(+), 17 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
Replace the explicit checking against ss_masks inside a for_each_subsys
block with for_each_subsys_which(ss_mask, ...), to take advantage of the
more readable macro.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 42 ++
1 file changed
a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h | 4 +
init/Kconfig | 16 ++
kernel/Makefile | 1 +
kernel/cgroup_pids.c | 367 ++
4 files changed, 388
the SYSRQ dance.
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Please read the FAQ at http://www.tux.org/lkml/
PIDs a
resource.
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Please read the FAQ at http://www.tux.org/lkml/
it belongs).
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h | 9 ++
kernel/cgroup.c| 80 +++---
kernel/fork.c | 12 +++-
3 files changed
inside a cgroup without hitting any reasonable kmemcg
policy. Once you've hit PID exhaustion, you're only in a marginally
better state than OOM. This subsystem allows PID exhaustion inside a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h
was renamed to `pids`.
[1]: https://lkml.org/lkml/2015/2/26/787
[2]: https://lkml.org/lkml/2015/3/2/437
Aleksa Sarai (2):
cgroups: allow a cgroup subsystem to reject a fork
cgroups: add a pids subsystem
include/linux/cgroup.h| 9 ++
include/linux/cgroup_subsys.h | 4 +
init/Kconfig
+ depends on PAGE_COUNTER
Whoops. I forgot to remove this line. Should I submit a revised
patchset or can you just change the patch?
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a cgroup, allowing for cgroups to perform fairly basic resource
limitation which it currently doesn't have the capability to do.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h | 4 +
init/Kconfig | 10 +++
kernel/Makefile | 1 +
kernel
to do such
rudimentary resource management (which currently only exists for process
trees).
Aleksa Sarai (2):
cgroups: allow a cgroup subsystem to reject a fork
cgroups: add an nproc subsystem
include/linux/cgroup.h| 9 ++-
include/linux/cgroup_subsys.h | 4 +
init/Kconfig
--
Make the cgroup subsystem post fork callback return an error code so
that subsystems can accept or reject a fork from completing with a
custom error value.
This is in preparation for implementing the numtasks cgroup scope.
Signed-off-by: Aleksa Sarai cyp
a cgroup, allowing for cgroups to perform fairly basic resource
limitation which it currently doesn't have the capability to do.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h | 4 +
init/Kconfig | 10 +++
kernel/Makefile | 1 +
kernel
is exposed (which is when fork) is called, and cancel_fork
is run during the cleanup of copy_process if the fork fails due to other
reasons.
[1]: https://lkml.org/lkml/2015/2/22/204
Aleksa Sarai (2):
cgroups: allow a cgroup subsystem to reject a fork
cgroups: add an nproc subsystem
include/linux
it belongs).
This is in preparation for implementing the nproc cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h | 9 ++
kernel/cgroup.c| 80 +++---
kernel/fork.c | 12 +++-
3 files changed
. If a subsys doesn't have pre, it's
NULL. I don't see anything weird about that, so let's please go that
way.
Alright, if you think that's the best way. I still think it's weird, but I
guess that's probably just down to personal taste.
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use INT_MAX for now.
3. Please FWD this discussion to the mailing lists with a summary.
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association.
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Please read the FAQ at http://www.tux.org/lkml/
IMO this should be done in a separate patchset [if at all]). Also, your
later comments would fix the subsys bitmask problem (we can just pass the
default %NULL), we don't even need to test the index.
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() does. I can remove the
UNUSED_IDENT() if you want, that was just to make sure you don't get clashes
with other unused idents. COUNT() is so that we don't have to manually add
CGROUP_TAG_COUNT for every tag we add.
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for CGROUP_TAG
enumerations to be be defined and used (as well as CGROUP_TAG_COUNT).
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h| 47 +-
include/linux/cgroup_subsys.h | 27
a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h | 5 +
init/Kconfig | 16 ++
kernel/Makefile | 1 +
kernel/cgroup_pids.c | 368 ++
4 files changed, 390
Replace the explicit checking against ss_masks inside a for_each_subsys
block with for_each_subsys_which(ss_mask, ...), to take advantage of the
more readable macro.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 42 ++
1 file changed
separate bitmasks for
each callback to make (ss-{fork,exit}) checks unnecessary.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 43 ++-
1 file changed, 26 insertions(+), 17 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
UNUSED_IDENT()
magic) and not use __COUNTER__.
* Removed the SUBSYS_TAG_COUNT macro and replaced it with a hard-coded
CGROUP_PREFORK_COUNT macro.
[1]: https://lkml.org/lkml/2015/4/11/237
Aleksa Sarai (4):
cgroups: use bitmask to filter for_each_subsys
cgroups: replace explicit ss_mask
a ref on a
css_set give you an implicit ref on a css inside that css_set, or are
those two orthogonal operations?
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this in the comments
if you want.
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Please read the FAQ at http://www.tux.org
the task is being migrated away
from is and just uncharge that inside -can_attach.
On the same point, are all the tasks in a tset passed to -can_attach
guaranteed to have the same css? Or do I have to uncharge each one
individually?
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naive solution?
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as the maximum valid value).
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Please read the FAQ at http://www.tux.org/lkml/
up a whole bunch of comments that were too pids-specific or not
explicit enough.
[1]: https://lkml.org/lkml/2015/4/19/39
[2]: http://lkml.kernel.org/g/1428350318-8215-8-git-send-email...@kernel.org
Aleksa Sarai (6):
cgroup: switch to unsigned long for bitmasks
cgroup: use bitmask to filter
separate bitmasks for
each callback to make (ss-{fork,exit}) checks unnecessary.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 46 +-
1 file changed, 29 insertions(+), 17 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
Hi Tejun,
One question RE: defaults for .config. What is the kernel policy for
deciding if a particular subsystem should be made enabled-by-default?
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Switch the type of all internal cgroup masks to (unsigned long), which
is the correct type for bitmasks. This is in preparation for the
for_each_subsys_which patch.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 39 ---
1 file changed, 20
This patch is in preparation for the pids cgroup subsystem patchset.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h | 16
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index e7da0aa
for CGROUP_TAG
enumerations to be be defined and used (as well as CGROUP_TAG_COUNT).
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h| 35 +++--
include/linux/cgroup_subsys.h | 17
From: Tejun Heo t...@kernel.org
bio_associate_current() currently open codes task_css() and
css_tryget_online() to find and pin $current's blkcg css. Abstract it
into task_get_css() which is implemented from cgroup side. As a task
is always associated with an online css for every subsystem
Replace the explicit checking against ss_masks inside a for_each_subsys
block with for_each_subsys_which(..., ss_mask), to take advantage of the
more readable macro.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 44
1 file
a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
CREDITS | 5 +
include/linux/cgroup_subsys.h | 5 +
init/Kconfig | 16 ++
kernel/Makefile | 1 +
kernel/cgroup_pids.c | 379
From: Tejun Heo t...@kernel.org
bio_associate_current() currently open codes task_css() and
css_tryget_online() to find and pin $current's blkcg css. Abstract it
into task_get_css() which is implemented from cgroup side. As a task
is always associated with an online css for every subsystem
This is in preparation for implementing the pids cgroup subsystem. It is
not a functional change and should not change any behavior.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h | 16
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git
separate bitmasks for
each callback to make (ss-{fork,exit}) checks unnecessary.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 51 +++
1 file changed, 31 insertions(+), 20 deletions(-)
diff --git a/kernel/cgroup.c b/kernel
a
CGROUP_CANFORK_COUNT macro to make arrays easier to define.
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h| 27 --
include/linux/cgroup_subsys.h | 17 +
kernel/cgroup.c | 84
This adds a macro to get the css of a tset (using task_get_css()) by
just grabbing a ref to the first item in the tset (since there is a
guarantee that all tasks in a tset share a css).
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp
a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
CREDITS | 5 +
include/linux/cgroup_subsys.h | 5 +
init/Kconfig | 16 ++
kernel/Makefile | 1 +
kernel/cgroup_pids.c | 355
This is a small update to v11 of the pids patchset[1], including:
* Fix up (incorrect) commit messages.
* Remove defunct code.
* Modify subsys_canfork_private{,p} signatures to use
(void *[SUBSYS_CANFORK_COUNT]).
[1]: https://lkml.org/lkml/2015/5/16/1
Aleksa Sarai (7):
cgroup: switch
Switch the type of all internal cgroup masks to (unsigned long), which
is the correct type for bitmasks. This is in preparation for the
for_each_subsys_which patch.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 39 ---
1 file changed, 20
Replace the explicit checking against ss_masks inside a for_each_subsys
block with for_each_subsys_which(..., ss_mask), to take advantage of the
more readable macro.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 44
1 file
I just realised I didn't remove a few incorrect comments and some of
the other patches need a small amount of fixing up. I'll send a
corrected patchset in an hour or so.
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, no?
Would you be okay with this?
if (limit 0 || limit = PIDS_MAX)
I'd prefer if we used PIDS_MAX as the maximum input value as well as
being the internal representation of the maximum, rather than
switching to something like INT_MAX.
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if (CGROUP_PREFORK_START = ssid ssid CGROUP_PREFORK_END)
return ss_state[ssid - CGROUP_PREFORK_START];
return NULL;
What would be a nice name for it? I can't think of anything better
than __get_ss_private() and __get_ss_privatep().
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for INT_MAX in
the first place. Do you remember why we tried INT_MAX at all?
Thanks.
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I think it's because we didn't want to expose PIDS_MAX to userspace.
But we're not *really* exposing it, we're just enforcing the input
limit for max.
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change between -can_attach() and
-cancel_attach()).
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Please read
Hi Tejun,
Applied 1-4 but skipped bio_associate_current() changes from this
patch. I'll route that part through a different patchset.
Do you want the updated versions of 6-8 of the patchset to be based on
your tree's for-next?
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Hi Tejun,
This is in preparation for implementing the pids cgroup subsystem. It is
not a functional change and should not change any behavior.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
I did a big reorg of cgroup.h and split of cgroup-defs.h from it and
this patch doesn't seem
] or after it checks [which means you'll hit the
parent's limit and won't be able to fork]).
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crazy and breaks stuff like:
if (...)
for_each_subsys_which(...)
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Hi,
Do you also want me to completely drop the COUNT macro? IMO it makes
the CGROUP_TAG_COUNT consolidation much nicer.
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More
in
semantics, but I'll do that if you prefer it that way.
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Please read
CGROUP_TAGNAME_COUNT(CGROUP_TAGNAME_END - CGROUP_TAGNAME_START)
At maximum, we're only gonna have a few of these. No reason to be
smart about it.
Yeah, that's fair I guess.
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the range of a
tagged section much easier.
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Aleksa Sarai (cyphar)
www.cyphar.com
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a tagging macro to cgroup_subsys.h, so that the ss_state array can
be CGROUP_PREFORK_COUNT in size.
[1]: https://lkml.org/lkml/2015/4/1/145
Aleksa Sarai (4):
cgroups: use bitmask to filter for_each_subsys
cgroups: replace explicit ss_mask checking with for_each_subsys_which
cgroups: allow
a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup_subsys.h | 5 +
init/Kconfig | 16 ++
kernel/Makefile | 1 +
kernel/cgroup_pids.c | 367 ++
4 files changed, 389
Replace the explicit checking against ss_masks inside a for_each_subsys
block with for_each_subsys_which(ss_mask, ...), to take advantage of the
more readable macro.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 42 ++
1 file changed
separate bitmasks for
each callback to make (ss-{fork,exit}) checks unnecessary.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 43 ++-
1 file changed, 26 insertions(+), 17 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
for CGROUP_TAG
enumerations to be be defined and used (as well as CGROUP_TAG_COUNT).
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup.h| 67 +-
include/linux/cgroup_subsys.h
code essentially unreadable).
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Aleksa Sarai (cyphar)
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into child is violating the constraints and has to
be refused. Anything else is just dirty hackery.
Whoops. Yes, you're completely right. All right, I'll fix up the
patchset in a few days.
--
Aleksa Sarai (cyphar)
www.cyphar.com
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a
CGROUP_CANFORK_COUNT macro to make arrays easier to define.
This is in preparation for implementing the pids cgroup subsystem.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
include/linux/cgroup-defs.h | 10 +-
include/linux/cgroup.h| 15 +++--
include/linux/cgroup_subsys.h | 23
From: Tejun Heo t...@kernel.org
Implement task_get_css() which find and pins the css for the specified
task and subsys. As a task is always associated with an online css
for every subsystem except while the css_set update is propagating,
task_get_css() retries till css_tryget_online() succeeds.
Fix the fact that @ssid is uninitialised in the case where
CGROUP_SUBSYS_COUNT = 0 by setting ssid to 0.
Fixes: cb4a31675270 (cgroup: use bitmask to filter for_each_subsys)
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
kernel/cgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion
in a marginally
better state than OOM. This subsystem allows PID exhaustion inside a
cgroup to be prevented.
Signed-off-by: Aleksa Sarai cyp...@cyphar.com
---
CREDITS | 5 +
include/linux/cgroup_subsys.h | 5 +
init/Kconfig | 16 ++
kernel/Makefile | 1
and
kernel/cgroup.c.
[1]: https://lkml.org/lkml/2015/6/5/857
Aleksa Sarai (3):
cgroup: fix uninitialised iterator in for_each_subsys_which
cgroup: allow a cgroup subsystem to reject a fork
cgroup: implement the PIDs subsystem
Tejun Heo (1):
cgroup, block: implement task_get_css()
CREDITS
the for_each_subsys_which API for
iterating over active cgroups. :/
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;
cgroup_taskset_for_each(task, tset)
css_put(task_css(task, pids_cgrp_id));
}
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Aleksa Sarai (cyphar)
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err = pids_try_charge(pids, 1);
if (err)
goto out_fail;
Disregard this and the revert code. This was from me testing making
attach obey the set limit (which isn't going to in to the patchset).
--
Aleksa Sarai (cyphar)
www.cyphar.com
/439
Aleksa Sarai (4):
cgroup: use bitmask to filter for_each_subsys
cgroup: replace explicit ss_mask checking with for_each_subsys_which
cgroup: allow a cgroup subsystem to reject a fork
cgroup: implement the PIDs subsystem
Tejun Heo (1):
cgroup, block: implement task_get_css()
CREDITS
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