diff options
| author |   K Prateek Nayak <kprateek.nayak@amd.com> | 2024-12-20 06:32:23 +0000 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2024-12-20 15:31:18 +0100 |
| commit | 011b3a14dc66c40066d08d60a768e14ede7ef351 (patch) | |
| tree | 4cf36cd633438bb1ed7f45240620a74029da38a6 | |
| parent | sched: Move sched domain name out of CONFIG_SCHED_DEBUG (diff) | |
| download | wireguard-linux-011b3a14dc66c40066d08d60a768e14ede7ef351.tar.xz wireguard-linux-011b3a14dc66c40066d08d60a768e14ede7ef351.zip | |
sched/stats: Print domain name in /proc/schedstat
Currently, there does not exist a straightforward way to extract the
names of the sched domains and match them to the per-cpu domain entry in
/proc/schedstat other than looking at the debugfs files which are only
visible after enabling "verbose" debug after commit 34320745dfc9
("sched/debug: Put sched/domains files under the verbose flag")
Since tools like `perf sched stats`[1] require displaying per-domain
information in user friendly manner, display the names of sched domain,
alongside their level in /proc/schedstat.
Domain names also makes the /proc/schedstat data unambiguous when some
of the cpus are offline. For example, on a 128 cpus AMD Zen3 machine
where CPU0 and CPU64 are SMT siblings and CPU64 is offline:
Before:
cpu0 ...
domain0 ...
domain1 ...
cpu1 ...
domain0 ...
domain1 ...
domain2 ...
After:
cpu0 ...
domain0 MC ...
domain1 PKG ...
cpu1 ...
domain0 SMT ...
domain1 MC ...
domain2 PKG ...
[1] https://lore.kernel.org/lkml/20241122084452.1064968-1-swapnil.sapkal@amd.com/
Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Swapnil Sapkal <swapnil.sapkal@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20241220063224.17767-6-swapnil.sapkal@amd.com
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/stats.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c index 802bd9398a2e..5f563965976c 100644 --- a/kernel/sched/stats.c +++ b/kernel/sched/stats.c @@ -138,7 +138,7 @@ static int show_schedstat(struct seq_file *seq, void *v) for_each_domain(cpu, sd) { enum cpu_idle_type itype; - seq_printf(seq, "domain%d %*pb", dcount++, + seq_printf(seq, "domain%d %s %*pb", dcount++, sd->name, cpumask_pr_args(sched_domain_span(sd))); for (itype = 0; itype < CPU_MAX_IDLE_TYPES; itype++) { seq_printf(seq, " %u %u %u %u %u %u %u %u %u %u %u", |