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1031a15929
Currently: $ perf stat -e cycles:u -e cycles:k true Performance counter stats for 'true': 2,24,699 cycles:u <not counted> cycles:k (0.00%) 0.000788087 seconds time elapsed We can not count more than one cycle counter in one instance,because we allow to map cycle counter into PMCCNTR_EL0 only. However, if I did not miss anything then specification do not prohibit to use PMEVCNTR<n>_EL0 for cycle count as well. Modify the code so that it still prefers to use PMCCNTR_EL0 for cycle counter, however allow to use PMEVCNTR<n>_EL0 if PMCCNTR_EL0 is already in use. After this patch: $ perf stat -e cycles:u -e cycles:k true Performance counter stats for 'true': 2,17,310 cycles:u 7,40,009 cycles:k 0.000764149 seconds time elapsed Signed-off-by: Pratyush Anand <panand@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
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.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.