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tracing/uprobes: Move argument fetching to uprobe_dispatcher() 

A single uprobe event might serve different users like ftrace and
perf.  And this is especially important for upcoming multi buffer
support.  But in this case it'll fetch (same) data from userspace
multiple times.  So move it to the beginning of the dispatcher
function and reuse it for each users.

Link: http://lkml.kernel.org/r/1389946120-19610-3-git-send-email-namhyung@kernel.org

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Namhyung Kim 2014-01-17 17:08:37 +09:00 committed by Steven Rostedt
parent a43b970430
commit dd9fa555d7
1 changed files with 56 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

93
kernel/trace/trace_uprobe.c
View File

@ -759,30 +759,25 @@ static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb)
}
static void __uprobe_trace_func(struct trace_uprobe *tu,
unsigned long func, struct pt_regs *regs)
unsigned long func, struct pt_regs *regs,
struct uprobe_cpu_buffer *ucb, int dsize)
{
struct uprobe_trace_entry_head *entry;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
struct uprobe_cpu_buffer *ucb;
void *data;
int size, dsize, esize;
int size, esize;
struct ftrace_event_call *call = &tu->tp.call;
dsize = __get_data_size(&tu->tp, regs);
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
if (WARN_ON_ONCE(!uprobe_cpu_buffer || tu->tp.size + dsize > PAGE_SIZE))
if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE))
return;
ucb = uprobe_buffer_get();
store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
size = esize + tu->tp.size + dsize;
event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
size, 0, 0);
if (!event)
goto out;
return;
entry = ring_buffer_event_data(event);
if (is_ret_probe(tu)) {
@ -798,23 +793,22 @@ static void __uprobe_trace_func(struct trace_uprobe *tu,
if (!call_filter_check_discard(call, entry, buffer, event))
trace_buffer_unlock_commit(buffer, event, 0, 0);
out:
uprobe_buffer_put(ucb);
}
/* uprobe handler */
static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs,
struct uprobe_cpu_buffer *ucb, int dsize)
{
if (!is_ret_probe(tu))
__uprobe_trace_func(tu, 0, regs);
__uprobe_trace_func(tu, 0, regs, ucb, dsize);
return 0;
}
static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
struct pt_regs *regs)
struct pt_regs *regs,
struct uprobe_cpu_buffer *ucb, int dsize)
{
__uprobe_trace_func(tu, func, regs);
__uprobe_trace_func(tu, func, regs, ucb, dsize);
}
/* Event entry printers */
@ -1015,30 +1009,23 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
}
static void __uprobe_perf_func(struct trace_uprobe *tu,
unsigned long func, struct pt_regs *regs)
unsigned long func, struct pt_regs *regs,
struct uprobe_cpu_buffer *ucb, int dsize)
{
struct ftrace_event_call *call = &tu->tp.call;
struct uprobe_trace_entry_head *entry;
struct hlist_head *head;
struct uprobe_cpu_buffer *ucb;
void *data;
int size, dsize, esize;
int size, esize;
int rctx;
dsize = __get_data_size(&tu->tp, regs);
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
if (WARN_ON_ONCE(!uprobe_cpu_buffer))
return;
size = esize + tu->tp.size + dsize;
size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32);
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
return;
ucb = uprobe_buffer_get();
store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
preempt_disable();
head = this_cpu_ptr(call->perf_events);
if (hlist_empty(head))
@ -1068,24 +1055,25 @@ static void __uprobe_perf_func(struct trace_uprobe *tu,
perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
out:
preempt_enable();
uprobe_buffer_put(ucb);
}
/* uprobe profile handler */
static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs,
struct uprobe_cpu_buffer *ucb, int dsize)
{
if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
return UPROBE_HANDLER_REMOVE;
if (!is_ret_probe(tu))
__uprobe_perf_func(tu, 0, regs);
__uprobe_perf_func(tu, 0, regs, ucb, dsize);
return 0;
}
static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
struct pt_regs *regs)
struct pt_regs *regs,
struct uprobe_cpu_buffer *ucb, int dsize)
{
__uprobe_perf_func(tu, func, regs);
__uprobe_perf_func(tu, func, regs, ucb, dsize);
}
#endif /* CONFIG_PERF_EVENTS */
@ -1127,8 +1115,11 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
{
struct trace_uprobe *tu;
struct uprobe_dispatch_data udd;
struct uprobe_cpu_buffer *ucb;
int dsize, esize;
int ret = 0;
tu = container_of(con, struct trace_uprobe, consumer);
tu->nhit++;
@ -1137,13 +1128,29 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
current->utask->vaddr = (unsigned long) &udd;
#ifdef CONFIG_PERF_EVENTS
if ((tu->tp.flags & TP_FLAG_TRACE) == 0 &&
!uprobe_perf_filter(&tu->consumer, 0, current->mm))
return UPROBE_HANDLER_REMOVE;
#endif
if (WARN_ON_ONCE(!uprobe_cpu_buffer))
return 0;
dsize = __get_data_size(&tu->tp, regs);
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
ucb = uprobe_buffer_get();
store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
if (tu->tp.flags & TP_FLAG_TRACE)
ret |= uprobe_trace_func(tu, regs);
ret |= uprobe_trace_func(tu, regs, ucb, dsize);
#ifdef CONFIG_PERF_EVENTS
if (tu->tp.flags & TP_FLAG_PROFILE)
ret |= uprobe_perf_func(tu, regs);
ret |= uprobe_perf_func(tu, regs, ucb, dsize);
#endif
uprobe_buffer_put(ucb);
return ret;
}
@ -1152,6 +1159,8 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
{
struct trace_uprobe *tu;
struct uprobe_dispatch_data udd;
struct uprobe_cpu_buffer *ucb;
int dsize, esize;
tu = container_of(con, struct trace_uprobe, consumer);
@ -1160,13 +1169,23 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
current->utask->vaddr = (unsigned long) &udd;
if (WARN_ON_ONCE(!uprobe_cpu_buffer))
return 0;
dsize = __get_data_size(&tu->tp, regs);
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
ucb = uprobe_buffer_get();
store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
if (tu->tp.flags & TP_FLAG_TRACE)
uretprobe_trace_func(tu, func, regs);
uretprobe_trace_func(tu, func, regs, ucb, dsize);
#ifdef CONFIG_PERF_EVENTS
if (tu->tp.flags & TP_FLAG_PROFILE)
uretprobe_perf_func(tu, func, regs);
uretprobe_perf_func(tu, func, regs, ucb, dsize);
#endif
uprobe_buffer_put(ucb);
return 0;
}