Hello Waiman,
I could test the patch using the for-next branch in your tree. Just a NIT, it seemed that the message indicating the reason the isolated configuration was invalid is not printed anymore:
Commands: # mkdir cgroup # mount -t cgroup2 none cgroup/ # mkdir cgroup/A1 cgroup/B1 # echo "+cpuset" > cgroup/cgroup.subtree_control # echo 0-3 > cgroup/A1/cpuset.cpus # echo isolated > cgroup/A1/cpuset.cpus.partition # echo 4-6 > cgroup/B1/cpuset.cpus # cat cgroup/A1/cpuset.cpus.partition isolated # echo 0-4 > cgroup/A1/cpuset.cpus # cat cgroup/A1/cpuset.cpus.partition isolated invalid <--- used to have '(Cpu list in cpuset.cpus not exclusive)' # echo 0-3 > cgroup/A1/cpuset.cpus # cat cgroup/A1/cpuset.cpus.partition isolated <--- now working!
But when creating an isolated partition from overlapping cpusets, the message is printed: # mkdir cgroup # mount -t cgroup2 none cgroup/ # mkdir cgroup/A1 cgroup/B1 # echo "+cpuset" > cgroup/cgroup.subtree_control # echo 0-4 > cgroup/A1/cpuset.cpus # echo 4-6 > cgroup/B1/cpuset.cpus # echo isolated > cgroup/B1/cpuset.cpus.partition
# cat cgroup/A1/cpuset.cpus.partition member # cat cgroup/B1/cpuset.cpus.partition isolated invalid (Cpu list in cpuset.cpus not exclusive) <--- Complete message printed
On 9/30/23 05:44, Waiman Long wrote:
When a local partition becomes invalid, it won't transition back to valid partition automatically if a proper "cpuset.cpus.exclusive" or "cpuset.cpus" change is made. Instead, system administrators have to explicitly echo "root" or "isolated" into the "cpuset.cpus.partition" file at the partition root.
This patch now enables the automatic transition of an invalid local partition back to valid when there is a proper "cpuset.cpus.exclusive" or "cpuset.cpus" change.
Automatic transition of an invalid remote partition to a valid one, however, is not covered by this patch. They still need an explicit write to "cpuset.cpus.partition" to become valid again.
I'm not sure I understand what is meant by 'remote partition', is it possible to explain ? Or is the following illustrating what you mean ?
# mkdir cgroup # mount -t cgroup2 none cgroup/ # mkdir cgroup/A1 cgroup/B1 # echo "+cpuset" > cgroup/cgroup.subtree_control # echo 0-3 > cgroup/A1/cpuset.cpus # echo isolated > cgroup/A1/cpuset.cpus.partition # echo 4-6 > cgroup/B1/cpuset.cpus # echo isolated > cgroup/B1/cpuset.cpus.partition
# echo 0-4 > cgroup/A1/cpuset.cpus # cat cgroup/A1/cpuset.cpus.partition isolated invalid # cat cgroup/B1/cpuset.cpus.partition isolated invalid
# echo 0-3 > cgroup/A1/cpuset.cpus # cat cgroup/A1/cpuset.cpus.partition isolated # cat cgroup/B1/cpuset.cpus.partition isolated invalid <--- The remote CPU is not updated
The test_cpuset_prs.sh test script is updated to add new test cases to test this automatic state transition.
Reported-by: Pierre Gondois pierre.gondois@arm.com Link: https://lore.kernel.org/lkml/9777f0d2-2fdf-41cb-bd01-19c52939ef42@arm.com Signed-off-by: Waiman Long longman@redhat.com
kernel/cgroup/cpuset.c | 79 +++++++++++-------- .../selftests/cgroup/test_cpuset_prs.sh | 17 ++-- 2 files changed, 59 insertions(+), 37 deletions(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 15f399153a2e..93facdab513c 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -1806,17 +1806,28 @@ static int update_parent_effective_cpumask(struct cpuset *cs, int cmd, * * Compute add/delete mask to/from effective_cpus *
* addmask = effective_xcpus & ~newmask & parent->effective_xcpus* delmask = newmask & ~cs->effective_xcpus* & parent->effective_xcpus
* For valid partition:* addmask = exclusive_cpus & ~newmask* & parent->effective_xcpus* delmask = newmask & ~exclusive_cpus* & parent->effective_xcpus** For invalid partition:* delmask = newmask & parent->effective_xcpus
cpumask_andnot(tmp->addmask, xcpus, newmask);adding = cpumask_and(tmp->addmask, tmp->addmask,parent->effective_xcpus);
if (is_prs_invalid(old_prs)) {adding = false;deleting = cpumask_and(tmp->delmask,newmask, parent->effective_xcpus);} else {cpumask_andnot(tmp->addmask, xcpus, newmask);adding = cpumask_and(tmp->addmask, tmp->addmask,parent->effective_xcpus);
cpumask_andnot(tmp->delmask, newmask, xcpus);deleting = cpumask_and(tmp->delmask, tmp->delmask,parent->effective_xcpus);
cpumask_andnot(tmp->delmask, newmask, xcpus);deleting = cpumask_and(tmp->delmask, tmp->delmask,parent->effective_xcpus);}
- Make partition invalid if parent's effective_cpus could
- become empty and there are tasks in the parent.
@@ -1910,9 +1921,11 @@ static int update_parent_effective_cpumask(struct cpuset *cs, int cmd, /* * Transitioning between invalid to valid or vice versa may require
* changing CS_CPU_EXCLUSIVE.
* changing CS_CPU_EXCLUSIVE. In the case of partcmd_update,* validate_change() has already been successfully called and* CPU lists in cs haven't been updated yet. So defer it to later.
- if (old_prs != new_prs) {
- if ((old_prs != new_prs) && (cmd != partcmd_update)) { int err = update_partition_exclusive(cs, new_prs);
if (err) @@ -1960,6 +1973,9 @@ static int update_parent_effective_cpumask(struct cpuset *cs, int cmd, spin_unlock_irq(&callback_lock);
- if ((old_prs != new_prs) && (cmd == partcmd_update))
update_partition_exclusive(cs, new_prs);- if (adding || deleting) { update_tasks_cpumask(parent, tmp->addmask); update_sibling_cpumasks(parent, cs, tmp);
@@ -2356,8 +2372,9 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs, if (alloc_cpumasks(NULL, &tmp)) return -ENOMEM;
- if (is_partition_valid(cs)) {
if (cpumask_empty(trialcs->effective_xcpus)) {
- if (old_prs) {
if (is_partition_valid(cs) &&cpumask_empty(trialcs->effective_xcpus)) { invalidate = true; cs->prs_err = PERR_INVCPUS;@@ -2391,13 +2408,16 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs, */ invalidate = true; rcu_read_lock();
cpuset_for_each_child(cp, css, parent)
cpuset_for_each_child(cp, css, parent) {struct cpumask *xcpus = fetch_xcpus(trialcs);if (is_partition_valid(cp) &&
cpumask_intersects(trialcs->effective_xcpus, cp->effective_xcpus)) {
cpumask_intersects(xcpus, cp->effective_xcpus)) { rcu_read_unlock(); update_parent_effective_cpumask(cp, partcmd_invalidate, NULL, &tmp); rcu_read_lock(); }}@@ -2405,18 +2425,24 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs, if (retval < 0) goto out_free;
- if (is_partition_valid(cs)) {
- if (is_partition_valid(cs) ||
(is_partition_invalid(cs) && !invalidate)) {struct cpumask *xcpus = trialcs->effective_xcpus;if (cpumask_empty(xcpus) && is_partition_invalid(cs))xcpus = trialcs->cpus_allowed;- /*
*/ if (is_remote_partition(cs))
- Call remote_cpus_update() to handle valid remote partition
remote_cpus_update(cs, trialcs->effective_xcpus, &tmp);
remote_cpus_update(cs, xcpus, &tmp);
trialcs->effective_xcpus, &tmp);
xcpus, &tmp);
- Use trialcs->effective_cpus as a temp cpumask
@@ -2493,7 +2519,7 @@ static int update_exclusive_cpumask(struct cpuset *cs, struct cpuset *trialcs, if (retval) return retval;
- if (is_partition_valid(cs)) {
- if (old_prs) { if (cpumask_empty(trialcs->effective_xcpus)) { invalidate = true; cs->prs_err = PERR_INVCPUS;
@@ -2927,19 +2953,10 @@ static int update_prstate(struct cpuset *cs, int new_prs) return 0; /*
* For a previously invalid partition root with valid partition root* parent, treat it as if it is a "member". Otherwise, reject it as* remote partition cannot currently self-recover from an invalid* state.
* Treat a previously invalid partition root as if it is a "member".
- if (new_prs && is_prs_invalid(old_prs)) {
if (is_partition_valid(parent)) {old_prs = PRS_MEMBER;} else {cs->partition_root_state = -new_prs;return 0;}- }
- if (new_prs && is_prs_invalid(old_prs))
old_prs = PRS_MEMBER;if (alloc_cpumasks(NULL, &tmpmask)) return -ENOMEM; diff --git a/tools/testing/selftests/cgroup/test_cpuset_prs.sh b/tools/testing/selftests/cgroup/test_cpuset_prs.sh index 0f4f4a57ae12..243c4c926964 100755 --- a/tools/testing/selftests/cgroup/test_cpuset_prs.sh +++ b/tools/testing/selftests/cgroup/test_cpuset_prs.sh @@ -318,16 +318,18 @@ TEST_MATRIX=(
NIT (and not related to this patch): I think the usage of X... is not documented in the test matrix, cf.
# P<v> = set cpus.partition (0:member, 1:root, 2:isolated) # C<l> = add cpu-list [...]
" C0-3:S+ C1-3:S+ C2 . X2-3 X2-3 T:P2:O2=0 O2=1 0 A1:0-3,A2:1-3,A3:2 A1:P0,A3:P-2" # cpus.exclusive.effective clearing test
- " C0-3:S+ C1-3:S+ C2 . X2-3:X . . . 0 A1:0-3,A2:1-3,A3:2,XA1:"
- " C0-3:S+ C1-3:S+ C2 . X2-3:X . . . 0 A1:0-3,A2:1-3,A3:2,XA1:"
- # Invalid to valid remote partition indirect transition test via member
- " C0-3:S+ C1-3 . . . X3:P2 . . 0 A1:0-3,A2:1-3,XA2: A2:P-2"
- # Invalid to valid remote partition transition test
- " C0-3:S+ C1-3 . . . X3:P2 . . 0 A1:0-3,A2:1-3,XA2: A2:P-2" " C0-3:S+ C1-3:X3:P2
. . X2-3 P0:P2 . . 0 A1:0-2,A2:3,XA2:3 A2:P2 3"
. . X2-3 P2 . . 0 A1:0-2,A2:3,XA2:3 A2:P2 3"# Invalid to valid local partition direct transition tests
- " C1-3:S+:P2 C2-3:X1:P2 . . . . . . 0 A1:1-3,XA1:1-3,A2:2-3:XA2: A1:P2,A2:P-2 1-3"
- " C1-3:S+:P2 C2-3:X1:P2 . . . X3:P2 . . 0 A1:1-2,XA1:1-3,A2:3:XA2:3 A1:P2,A2:P2 1-3"
- " C1-3:S+:P2 C2-3:X1:P2 . . . . . . 0 A1:1-3,XA1:1-3,A2:2-3:XA2: A1:P2,A2:P-2 1-3"
- " C1-3:S+:P2 C2-3:X1:P2 . . . X3:P2 . . 0 A1:1-2,XA1:1-3,A2:3:XA2:3 A1:P2,A2:P2 1-3"
- " C0-3:P2 . . C4-6 C0-4 . . . 0 A1:0-4,B1:4-6 A1:P-2,B1:P0"
- " C0-3:P2 . . C4-6 C0-4:C0-3 . . . 0 A1:0-3,B1:4-6 A1:P2,B1:P0 0-3"
# Local partition invalidation tests " C0-3:X1-3:S+:P2 C1-3:X2-3:S+:P2 C2-3:X3:P2 \ @@ -336,6 +338,9 @@ TEST_MATRIX=( . . X4 . . 0 A1:1-3,A2:1-3,A3:2-3,XA2:,XA3: A1:P2,A2:P-2,A3:P-2 1-3" " C0-3:X1-3:S+:P2 C1-3:X2-3:S+:P2 C2-3:X3:P2 \ . . C4 . . 0 A1:1-3,A2:1-3,A3:2-3,XA2:,XA3: A1:P2,A2:P-2,A3:P-2 1-3"
- # Local partition CPU change tests
- " C0-5:S+:P2 C4-5:S+:P1 . . . C3-5 . . 0 A1:0-2,A2:3-5 A1:P2,A2:P1 0-2"
- " C0-5:S+:P2 C4-5:S+:P1 . . C1-5 . . . 0 A1:1-3,A2:4-5 A1:P2,A2:P1 1-3"
# cpus_allowed/exclusive_cpus update tests " C0-3:X2-3:S+ C1-3:X2-3:S+ C2-3:X2-3 \