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| author |   Changbin Du <changbin.du@intel.com> | 2017-11-30 11:39:43 +0800 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-12-04 06:52:08 -0500 |
| commit | 90e406f96f630c07d631a021fd4af10aac913e77 (patch) | |
| tree | 319adb71056132723eb24456850dcd55196a6623 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | tracing: always define trace_{irq,preempt}_{enable_disable} (diff) | |
| download | linux-dev-90e406f96f630c07d631a021fd4af10aac913e77.tar.xz linux-dev-90e406f96f630c07d631a021fd4af10aac913e77.zip | |
tracing: Allocate mask_str buffer dynamically
The default NR_CPUS can be very large, but actual possible nr_cpu_ids
usually is very small. For my x86 distribution, the NR_CPUS is 8192 and
nr_cpu_ids is 4. About 2 pages are wasted.
Most machines don't have so many CPUs, so define a array with NR_CPUS
just wastes memory. So let's allocate the buffer dynamically when need.
With this change, the mutext tracing_cpumask_update_lock also can be
removed now, which was used to protect mask_str.
Link: http://lkml.kernel.org/r/1512013183-19107-1-git-send-email-changbin.du@intel.com
Fixes: 36dfe9252bd4c ("ftrace: make use of tracing_cpumask")
Cc: stable@vger.kernel.org
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions