Messages in this thread Patch in this message | | | From | riel@redhat ... | Subject | [PATCH 2/2] cpusets,isolcpus: add file to show isolated cpus in cpuset | Date | Wed, 25 Feb 2015 11:38:08 -0500 |
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From: Rik van Riel <riel@redhat.com>
The previous patch makes it so the code skips over isolcpus when building scheduler load balancing domains. This makes it hard to see for a user which of the CPUs in a cpuset are participating in load balancing, and which ones are isolated cpus.
Add a cpuset.isolcpus file with info on which cpus in a cpuset are isolated CPUs.
This file is read-only for now. In the future we could extend things so isolcpus can be changed at run time, for the root (system wide) cpuset only.
Cc: Peter Zijlstra <peterz@infradead.org> Cc: Clark Williams <williams@redhat.com> Cc: Li Zefan <lizefan@huawei.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Mike Galbraith <umgwanakikbuti@gmail.com> Cc: cgroups@vger.kernel.org Signed-off-by: Rik van Riel <riel@redhat.com> --- kernel/cpuset.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index b544e5229d99..94bf59588e23 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1563,6 +1563,7 @@ typedef enum { FILE_MEMORY_PRESSURE, FILE_SPREAD_PAGE, FILE_SPREAD_SLAB, + FILE_ISOLCPUS, } cpuset_filetype_t; static int cpuset_write_u64(struct cgroup_subsys_state *css, struct cftype *cft, @@ -1704,6 +1705,20 @@ static ssize_t cpuset_write_resmask(struct kernfs_open_file *of, return retval ?: nbytes; } +static void cpuset_seq_print_isolcpus(struct seq_file *sf, struct cpuset *cs) +{ + cpumask_var_t my_isolated_cpus; + + if (!alloc_cpumask_var(&my_isolated_cpus, GFP_KERNEL)) + return; + + cpumask_and(my_isolated_cpus, cs->cpus_allowed, cpu_isolated_map); + + seq_printf(sf, "%*pbl\n", nodemask_pr_args(my_isolated_cpus)); + + free_cpumask_var(my_isolated_cpus); +} + /* * These ascii lists should be read in a single call, by using a user * buffer large enough to hold the entire map. If read in smaller @@ -1733,6 +1748,9 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v) case FILE_EFFECTIVE_MEMLIST: seq_printf(sf, "%*pbl\n", nodemask_pr_args(&cs->effective_mems)); break; + case FILE_ISOLCPUS: + cpuset_seq_print_isolcpus(sf, cs); + break; default: ret = -EINVAL; } @@ -1893,6 +1911,12 @@ static struct cftype files[] = { .private = FILE_MEMORY_PRESSURE_ENABLED, }, + { + .name = "isolcpus", + .seq_show = cpuset_common_seq_show, + .private = FILE_ISOLCPUS, + }, + { } /* terminate */ }; -- 2.1.0
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