Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936150Ab3DITfx (ORCPT ); Tue, 9 Apr 2013 15:35:53 -0400 Received: from mx1.redhat.com ([209.132.183.28]:19709 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765118Ab3DITfv (ORCPT ); Tue, 9 Apr 2013 15:35:51 -0400 Date: Tue, 9 Apr 2013 21:32:35 +0200 From: Oleg Nesterov To: Steven Rostedt Cc: Ananth N Mavinakayanahalli , Srikar Dronamraju , Anton Arapov , Frederic Weisbecker , Ingo Molnar , linux-kernel@vger.kernel.org Subject: [PATCH v2 4/7] uprobes/tracing: Make uprobe_{trace,perf}_print() uretprobe-friendly Message-ID: <20130409193235.GA27244@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130409193200.GA26731@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3317 Lines: 100 Change uprobe_trace_print() and uprobe_perf_print() to check is_ret_probe() and fill ring_buffer_event accordingly. Also change uprobe_trace_func() and uprobe_perf_func() to not _print() if is_ret_probe() is true. Note that we keep ->handler() nontrivial even for uretprobe, we need this for filtering and for other potential extensions. Signed-off-by: Oleg Nesterov Tested-by: Anton Arapov --- kernel/trace/trace_uprobe.c | 34 +++++++++++++++++++++++++--------- 1 files changed, 25 insertions(+), 9 deletions(-) diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 72aa45e..0ed99a2 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -516,15 +516,22 @@ static void uprobe_trace_print(struct trace_uprobe *tu, int size, i; struct ftrace_event_call *call = &tu->call; - size = SIZEOF_TRACE_ENTRY(false) + tu->size; + size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); event = trace_current_buffer_lock_reserve(&buffer, call->event.type, - size, 0, 0); + size + tu->size, 0, 0); if (!event) return; entry = ring_buffer_event_data(event); - entry->vaddr[0] = instruction_pointer(regs); - data = DATAOF_TRACE_ENTRY(entry, false); + if (is_ret_probe(tu)) { + entry->vaddr[0] = func; + entry->vaddr[1] = instruction_pointer(regs); + data = DATAOF_TRACE_ENTRY(entry, true); + } else { + entry->vaddr[0] = instruction_pointer(regs); + data = DATAOF_TRACE_ENTRY(entry, false); + } + for (i = 0; i < tu->nr_args; i++) call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset); @@ -535,7 +542,8 @@ static void uprobe_trace_print(struct trace_uprobe *tu, /* uprobe handler */ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs) { - uprobe_trace_print(tu, 0, regs); + if (!is_ret_probe(tu)) + uprobe_trace_print(tu, 0, regs); return 0; } @@ -784,7 +792,7 @@ static void uprobe_perf_print(struct trace_uprobe *tu, void *data; int size, rctx, i; - size = SIZEOF_TRACE_ENTRY(false); + size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32); if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough")) return; @@ -795,8 +803,15 @@ static void uprobe_perf_print(struct trace_uprobe *tu, goto out; ip = instruction_pointer(regs); - entry->vaddr[0] = ip; - data = DATAOF_TRACE_ENTRY(entry, false); + if (is_ret_probe(tu)) { + entry->vaddr[0] = func; + entry->vaddr[1] = ip; + data = DATAOF_TRACE_ENTRY(entry, true); + } else { + entry->vaddr[0] = ip; + data = DATAOF_TRACE_ENTRY(entry, false); + } + for (i = 0; i < tu->nr_args; i++) call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset); @@ -812,7 +827,8 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs) if (!uprobe_perf_filter(&tu->consumer, 0, current->mm)) return UPROBE_HANDLER_REMOVE; - uprobe_perf_print(tu, 0, regs); + if (!is_ret_probe(tu)) + uprobe_perf_print(tu, 0, regs); return 0; } -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/