lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

perf, trace: Optimize tracepoints by using per-tracepoint-per-cpu hlist to track events

Browse Source 
Avoid the swevent hash-table by using per-tracepoint
hlists.

Also, avoid conditionals on the fast path by ordering
with probe unregister so that we should never get on
the callback path without the data being there.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20100521090710.473188012@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-05-19 14:02:22 +02:00
committed by Ingo Molnar
parent b7e2ecef92
commit 1c024eca51
7 changed files with 148 additions and 129 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
kernel/trace/trace_syscalls.c
View File

@@ -438,6 +438,7 @@ static void perf_syscall_enter(struct pt_regs *regs, long id)
{
struct syscall_metadata *sys_data;
struct syscall_trace_enter *rec;
struct hlist_head *head;
int syscall_nr;
int rctx;
int size;
@@ -467,8 +468,9 @@ static void perf_syscall_enter(struct pt_regs *regs, long id)
rec->nr = syscall_nr;
syscall_get_arguments(current, regs, 0, sys_data->nb_args,
(unsigned long *)&rec->args);
perf_trace_buf_submit(rec, size, rctx, 0, 1, regs,
sys_data->enter_event->perf_data);
head = per_cpu_ptr(sys_data->enter_event->perf_events, smp_processor_id());
perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head);
}
int perf_sysenter_enable(struct ftrace_event_call *call)
@@ -510,6 +512,7 @@ static void perf_syscall_exit(struct pt_regs *regs, long ret)
{
struct syscall_metadata *sys_data;
struct syscall_trace_exit *rec;
struct hlist_head *head;
int syscall_nr;
int rctx;
int size;
@@ -542,8 +545,8 @@ static void perf_syscall_exit(struct pt_regs *regs, long ret)
rec->nr = syscall_nr;
rec->ret = syscall_get_return_value(current, regs);
perf_trace_buf_submit(rec, size, rctx, 0, 1, regs,
sys_data->exit_event->perf_data);
head = per_cpu_ptr(sys_data->exit_event->perf_events, smp_processor_id());
perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head);
}
int perf_sysexit_enable(struct ftrace_event_call *call)