From: Peter Zijlstra <peterz@infradead.org>
To: Waiman Long <longman@redhat.com>
Cc: Tejun Heo <tj@kernel.org>, Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Ingo Molnar <mingo@redhat.com>,
cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, kernel-team@fb.com, pjt@google.com,
luto@amacapital.net, Mike Galbraith <efault@gmx.de>,
torvalds@linux-foundation.org, Roman Gushchin <guro@fb.com>,
Juri Lelli <juri.lelli@redhat.com>,
Patrick Bellasi <patrick.bellasi@arm.com>
Subject: Re: [PATCH v11 9/9] cpuset: Allow reporting of sched domain generation info
Date: Thu, 19 Jul 2018 15:54:29 +0200 [thread overview]
Message-ID: <20180719135429.GF2494@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1529825440-9574-10-git-send-email-longman@redhat.com>
On Sun, Jun 24, 2018 at 03:30:40PM +0800, Waiman Long wrote:
> This patch enables us to report sched domain generation information.
>
> If DYNAMIC_DEBUG is enabled, issuing the following command
>
> echo "file cpuset.c +p" > /sys/kernel/debug/dynamic_debug/control
>
> and setting loglevel to 8 will allow the kernel to show what scheduling
> domain changes are being made.
>
> Signed-off-by: Waiman Long <longman@redhat.com>
> ---
> kernel/cgroup/cpuset.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index 07a5575..62b7e61 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -836,6 +836,23 @@ static int generate_sched_domains(cpumask_var_t **domains,
> return ndoms;
> }
>
> +#ifdef CONFIG_DEBUG_KERNEL
> +static inline void debug_print_domains(cpumask_var_t *doms, int ndoms)
> +{
> + int i;
> + char buf[200];
> + char *ptr, *end = buf + sizeof(buf) - 1;
> +
> + for (i = 0, ptr = buf, *end = '\0'; i < ndoms; i++)
> + ptr += snprintf(ptr, end - ptr, "dom%d=%*pbl ", i,
> + cpumask_pr_args(doms[i]));
> +
> + pr_debug("Generated %d domains: %s\n", ndoms, buf);
> +}
> +#else
> +static inline void debug_print_domains(cpumask_var_t *doms, int ndoms) { }
> +#endif
I still hate this patch.. it prints information already available in
sched_debug and has that rediculous on-stack buffer.
next prev parent reply other threads:[~2018-07-19 13:54 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-24 7:30 [PATCH v11 0/9] cpuset: Enable cpuset controller in default hierarchy Waiman Long
2018-06-24 7:30 ` [PATCH v11 1/9] " Waiman Long
2018-06-24 7:30 ` [PATCH v11 2/9] cpuset: Add new v2 cpuset.sched.partition flag Waiman Long
2018-06-24 7:30 ` [PATCH v11 3/9] cpuset: Simulate auto-off of sched.partition at cgroup removal Waiman Long
2018-06-24 7:30 ` [PATCH v11 4/9] cpuset: Allow changes to cpus in a partition root Waiman Long
2018-06-24 7:30 ` [PATCH v11 5/9] cpuset: Make sure that partition flag work properly with CPU hotplug Waiman Long
2018-06-24 7:30 ` [PATCH v11 6/9] cpuset: Make generate_sched_domains() recognize reserved_cpus Waiman Long
2018-06-24 7:30 ` [PATCH v11 7/9] cpuset: Expose cpus.effective and mems.effective on cgroup v2 root Waiman Long
2018-07-02 16:53 ` Tejun Heo
2018-07-03 0:41 ` Waiman Long
2018-07-03 15:58 ` Tejun Heo
2018-07-06 20:32 ` Waiman Long
2018-07-10 15:23 ` Waiman Long
2018-07-18 15:21 ` Waiman Long
2018-07-18 15:31 ` Tejun Heo
2018-07-18 21:12 ` Waiman Long
2018-07-19 13:52 ` Peter Zijlstra
2018-07-19 14:04 ` Waiman Long
2018-07-19 15:30 ` Tejun Heo
2018-07-19 15:52 ` Waiman Long
2018-07-19 16:52 ` Tejun Heo
2018-07-19 17:22 ` Waiman Long
2018-07-19 17:25 ` Tejun Heo
2018-07-19 17:38 ` Waiman Long
2018-07-20 11:32 ` Peter Zijlstra
2018-07-20 11:31 ` Peter Zijlstra
2018-07-20 11:45 ` Tejun Heo
2018-07-20 12:04 ` Tejun Heo
2018-07-20 15:44 ` Peter Zijlstra
2018-07-20 15:56 ` Tejun Heo
2018-07-20 16:19 ` Waiman Long
2018-07-20 16:37 ` Peter Zijlstra
2018-07-20 17:09 ` Waiman Long
2018-07-20 17:41 ` Tejun Heo
2018-08-13 17:56 ` Waiman Long
2018-08-17 15:59 ` Tejun Heo
2018-08-18 1:03 ` Waiman Long
2018-07-27 21:21 ` Waiman Long
2018-07-20 16:25 ` Peter Zijlstra
2018-07-20 15:57 ` Waiman Long
2018-07-20 11:29 ` Peter Zijlstra
2018-06-24 7:30 ` [PATCH v11 8/9] cpuset: Don't rebuild sched domains if cpu changes in non-partition root Waiman Long
2018-06-24 7:30 ` [PATCH v11 9/9] cpuset: Allow reporting of sched domain generation info Waiman Long
2018-07-19 13:54 ` Peter Zijlstra [this message]
2018-07-19 13:56 ` Waiman Long
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