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authorIngo Molnar <mingo@elte.hu>2009-10-23 08:23:20 +0200
committerIngo Molnar <mingo@elte.hu>2009-10-23 08:23:20 +0200
commit43315956509ca6913764861ac7dec128b91eb1ec (patch)
tree60fd5647f150a46e63093a41417c2eef3e776b3d /Documentation/trace
parent9bf4e7fba8006d19846fec877b6da0616b2772de (diff)
parent6beba7adbe092e63dfe8d09fbd1e3ec140474a13 (diff)
Merge branch 'perf/core' into perf/probes
Conflicts: tools/perf/Makefile Merge reason: - fix the conflict - pick up the pr_*() infrastructure to queue up dependent patch Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/trace')
-rw-r--r--Documentation/trace/ftrace-design.txt13
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/trace/ftrace-design.txt b/Documentation/trace/ftrace-design.txt
index 7003e10f10f..641a1ef2a7f 100644
--- a/Documentation/trace/ftrace-design.txt
+++ b/Documentation/trace/ftrace-design.txt
@@ -213,10 +213,19 @@ If you can't trace NMI functions, then skip this option.
<details to be filled>
-HAVE_FTRACE_SYSCALLS
+HAVE_SYSCALL_TRACEPOINTS
---------------------
-<details to be filled>
+You need very few things to get the syscalls tracing in an arch.
+
+- Have a NR_syscalls variable in <asm/unistd.h> that provides the number
+ of syscalls supported by the arch.
+- Implement arch_syscall_addr() that resolves a syscall address from a
+ syscall number.
+- Support the TIF_SYSCALL_TRACEPOINT thread flags
+- Put the trace_sys_enter() and trace_sys_exit() tracepoints calls from ptrace
+ in the ptrace syscalls tracing path.
+- Tag this arch as HAVE_SYSCALL_TRACEPOINTS.
HAVE_FTRACE_MCOUNT_RECORD