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authorAndi Kleen <andi@firstfloor.org>2009-04-27 19:44:11 +0400
committerRobert Richter <robert.richter@amd.com>2009-05-08 13:06:33 +0400
commit1dcdb5a9e7c235e6e80f1f4d5b8247b3e5347e48 (patch)
tree197b80f4941f535fd3b251755b74b557cb8d9ca8 /Documentation/kernel-parameters.txt
parent54f2c841fa0007e5fee3b7d01a911c774f0a6cda (diff)
downloadlinux-1dcdb5a9e7c235e6e80f1f4d5b8247b3e5347e48.tar.xz
oprofile: re-add force_arch_perfmon option
This re-adds the force_arch_perfmon option that was in the original arch perfmon patchkit. Originally this was rejected in favour of a generalized perfmon=name option, but it turned out implementing the later in a reliable way is hard (and it would have been easy to crash the kernel if a user gets it wrong) But now Atom and Core i7 support being readded a user would need to update their oprofile userland to beyond 0.9.4 to use oprofile again on Atom or Core i7. To avoid this problem readd the force_arch_perfmon option. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 90b3924071b6..9b9566bf3301 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1650,6 +1650,12 @@ and is between 256 and 4096 characters. It is defined in the file
oprofile.timer= [HW]
Use timer interrupt instead of performance counters
+ oprofile.force_arch_perfmon=1 [X86]
+ Force use of architectural perfmon instead of
+ the CPU specific event set.
+ This might be useful if you have older oprofile
+ userland or if you want common events over Intel CPUs.
+
osst= [HW,SCSI] SCSI Tape Driver
Format: <buffer_size>,<write_threshold>
See also Documentation/scsi/st.txt.