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| author | Derek Fults <dfults@sgi.com> | 2006-12-06 20:37:11 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:35 -0800 |
| commit | 22f2e280179946b8be1e2205b8654f2cb4abbf64 (patch) | |
| tree | bf40a2070381fc83a365eff736763264c466db16 /Documentation/kernel-parameters.txt | |
| parent | 8f63fdbbd6de7d734c036948bf7c4b2bebe3ad99 (diff) | |
| download | lwn-22f2e280179946b8be1e2205b8654f2cb4abbf64.tar.gz lwn-22f2e280179946b8be1e2205b8654f2cb4abbf64.zip | |
[PATCH] get_options to allow a hypenated range for isolcpus
This allows a hyphenated range of positive numbers in the string passed
to command line helper function, get_options.
Currently the command line option "isolcpus=" takes as its argument a
list of cpus.
Format: <cpu number>,...,<cpu number>
Valid values of <cpu_number> include all cpus, 0 to "number of CPUs in
system - 1". This can get extremely long when isolating the majority of
cpus on a large system. The kernel isolcpus code would not need any
changing to use this feature. To use it, the change would be in the
command line format for 'isolcpus='
Format:
<cpu number>,...,<cpu number>
or
<cpu number>-<cpu number> (must be a positive range in ascending
order.)
or a mixture
<cpu number>,...,<cpu number>-<cpu number>
Signed-off-by: Derek Fults <dfults@sgi.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 1e183bd33d71..8fe6b834ef27 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -714,7 +714,12 @@ and is between 256 and 4096 characters. It is defined in the file Format: <RDP>,<reset>,<pci_scan>,<verbosity> isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. - Format: <cpu number>,...,<cpu number> + Format: + <cpu number>,...,<cpu number> + or + <cpu number>-<cpu number> (must be a positive range in ascending order) + or a mixture + <cpu number>,...,<cpu number>-<cpu number> This option can be used to specify one or more CPUs to isolate from the general SMP balancing and scheduling algorithms. The only way to move a process onto or off |