The kernel needs to have PERF_EVENTS built otherwise we will run into
the following:
root@(none):/# perf top
perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error
89 (Function not implemented)
perf_event_open(..., 0) failed unexpectedly with error 89 (Function not
implemented)
Error:
The sys_perf_event_open() syscall returned with 89 (Function not
implemented) for event (cycles).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?
Make sure this functional dependency is captured.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Toolchain built for ARCv1 (read for ARC700 cores) by default has
disabled atomic ops (-mno-atomic). When we build Linux kernel for ARC770
which has LL/SC instructions and thus may handle normally atomic ops we
explicitly add "-matomic" in CFLAGS. But since user-space perf utility has
no way to extract CPU config options from Kconfig/defconfig it uses
compiler default settings.
In case of ARCv2 (read ARC HS38) atomics are enabled by default and so
perf builds perfectly fine thus reenabling perf for ARC HS38 (actually
for non-ARC700 targets).
Signed-off-by: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
This fix contains 2 parts:
- kernel 4.1: backport upstream patch "perf build: Do not fail on missing Build file"
- add NO_LZMA=1 to perf MAKE_FLAGS to disable LZMA support
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
SVN-Revision: 47338
There are some places where there is a redundant declaration of
strlcpy() that prevents building perf otherwise.
Signed-off-by: John Szakmeister <john@szakmeister.net>
SVN-Revision: 44926
perf was in the oldpackages repository, but it makes more sense to have
it part of the default package set since we build it from the Linux
kernel sources.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
SVN-Revision: 43418
