提交 018df72d 编写于 作者: M Mike Frysinger 提交者: Ingo Molnar

perf_counter: Start documenting HAVE_PERF_COUNTERS requirements

Help out arch porters who want to support perf counters by listing some
basic requirements.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1244827063-24046-1-git-send-email-vapier@gentoo.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 974802ea
......@@ -936,6 +936,8 @@ config AIO
config HAVE_PERF_COUNTERS
bool
help
See tools/perf/design.txt for details.
menu "Performance Counters"
......
......@@ -440,3 +440,18 @@ by this process or by another, and doesn't affect any counters that
this process has created on other processes. It only enables or
disables the group leaders, not any other members in the groups.
Arch requirements
-----------------
If your architecture does not have hardware performance metrics, you can
still use the generic software counters based on hrtimers for sampling.
So to start with, in order to add HAVE_PERF_COUNTERS to your Kconfig, you
will need at least this:
- asm/perf_counter.h - a basic stub will suffice at first
- support for atomic64 types (and associated helper functions)
- set_perf_counter_pending() implemented
If your architecture does have hardware capabilities, you can override the
weak stub hw_perf_counter_init() to register hardware counters.
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册