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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-04-11 11:07:11 -0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-04-27 19:52:47 -0400
commit49717cb40410fe4b563968680ff7c513967504c6 (patch)
treef48968ecb804154407bb5599278c67ac8e0e27cd /tools/perf/util/vdso.c
parent6d87669357936bffa1e8fea7a4e7743e76905736 (diff)
kthread: Document ways of reducing OS jitter due to per-CPU kthreads
The Linux kernel uses a number of per-CPU kthreads, any of which might contribute to OS jitter at any time. The usual approach to normal kthreads, namely to bind them to a "housekeeping" CPU, does not work with these kthreads because they cannot operate correctly if moved to some other CPU. This commit therefore lists ways of controlling OS jitter from the Linux kernel's per-CPU kthreads. It also lists some ways of diagnosing excessive jitter. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Kevin Hilman <khilman@linaro.org> Cc: Christoph Lameter <cl@linux.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Olivier Baetz <olivier.baetz@novasparks.com> Cc: Pradeep Satyanarayana <pradeeps@linux.vnet.ibm.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'tools/perf/util/vdso.c')
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