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Message-ID: <ZsN/2DBi3CyW9gis@linux.ibm.com>
Date: Mon, 19 Aug 2024 22:54:40 +0530
From: Saket Kumar Bhaskar <skb99@...ux.ibm.com>
To: Chen Ridong <chenridong@...wei.com>
Cc: tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org,
longman@...hat.com, adityakali@...gle.com, sergeh@...nel.org,
mkoutny@...e.com, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next 2/3] cgroup/cpuset: remove fetch_xcpus
On Fri, Aug 16, 2024 at 08:27:26AM +0000, Chen Ridong wrote:
> Both fetch_xcpus and user_xcpus functions are used to retrieve the value
> of exclusive_cpus. If exclusive_cpus is not set, cpus_allowed is the
> implicit value used as exclusive in a local partition. I can not imagine
> a scenario where effective_xcpus is not empty when exclusive_cpus is
> empty. Therefore, I suggest removing the fetch_xcpus function.
>
> Signed-off-by: Chen Ridong <chenridong@...wei.com>
> ---
> kernel/cgroup/cpuset.c | 13 +++----------
> 1 file changed, 3 insertions(+), 10 deletions(-)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index fdd5346616d3..8be0259065f5 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -771,13 +771,6 @@ static inline bool xcpus_empty(struct cpuset *cs)
> cpumask_empty(cs->exclusive_cpus);
> }
>
> -static inline struct cpumask *fetch_xcpus(struct cpuset *cs)
> -{
> - return !cpumask_empty(cs->exclusive_cpus) ? cs->exclusive_cpus :
> - cpumask_empty(cs->effective_xcpus) ? cs->cpus_allowed
> - : cs->effective_xcpus;
> -}
> -
> /*
> * cpusets_are_exclusive() - check if two cpusets are exclusive
> *
> @@ -785,8 +778,8 @@ static inline struct cpumask *fetch_xcpus(struct cpuset *cs)
> */
> static inline bool cpusets_are_exclusive(struct cpuset *cs1, struct cpuset *cs2)
> {
> - struct cpumask *xcpus1 = fetch_xcpus(cs1);
> - struct cpumask *xcpus2 = fetch_xcpus(cs2);
> + struct cpumask *xcpus1 = user_xcpus(cs1);
> + struct cpumask *xcpus2 = user_xcpus(cs2);
>
> if (cpumask_intersects(xcpus1, xcpus2))
> return false;
> @@ -2585,7 +2578,7 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
> invalidate = true;
> rcu_read_lock();
> cpuset_for_each_child(cp, css, parent) {
> - struct cpumask *xcpus = fetch_xcpus(trialcs);
> + struct cpumask *xcpus = user_xcpus(trialcs);
>
> if (is_partition_valid(cp) &&
> cpumask_intersects(xcpus, cp->effective_xcpus)) {
> --
> 2.34.1
>
Hi,
In update_cpumask too fetch_xcpus is used. You may want to remove it from there too.
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 40ec4abaf440..1b4ee6403de6 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -2587,7 +2587,7 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
invalidate = true;
rcu_read_lock();
cpuset_for_each_child(cp, css, parent) {
- struct cpumask *xcpus = fetch_xcpus(trialcs);
+ struct cpumask *xcpus = user_xcpus(trialcs);
if (is_partition_valid(cp) &&
cpumask_intersects(xcpus, cp->effective_xcpus)) {
Reviewed-by: Saket Kumar Bhaskar <skb99@...ux.ibm.com>
Thanks,
Saket
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