Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756795Ab3C2SSQ (ORCPT ); Fri, 29 Mar 2013 14:18:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:14210 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753513Ab3C2SSN (ORCPT ); Fri, 29 Mar 2013 14:18:13 -0400 Date: Fri, 29 Mar 2013 19:15:48 +0100 From: Oleg Nesterov To: Ananth N Mavinakayanahalli , Srikar Dronamraju , Steven Rostedt Cc: Anton Arapov , Frederic Weisbecker , Ingo Molnar , linux-kernel@vger.kernel.org Subject: [PATCH 4/4] uprobes/tracing: generalize struct uprobe_trace_entry_head Message-ID: <20130329181548.GA20700@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130329181520.GA20670@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: 6303 Lines: 189 struct uprobe_trace_entry_head has a single member for reporting, "unsigned long ip". If we want to support uretprobes we need to create another struct which has "func" and "ret_ip" and duplicate a lot of functions, like trace_kprobe.c does. To avoid this copy-and-paste horror we turn ->ip into ->vaddr[] and add couple of trivial helpers to calculate sizeof/data. This uglifies the code a bit, but this allows us to avoid a lot more complications later, when we add the support for ret-probes. Signed-off-by: Oleg Nesterov --- kernel/trace/trace.h | 5 --- kernel/trace/trace_uprobe.c | 61 ++++++++++++++++++++++++------------------ 2 files changed, 35 insertions(+), 31 deletions(-) diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 57d7e53..6ca57cf 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -103,11 +103,6 @@ struct kretprobe_trace_entry_head { unsigned long ret_ip; }; -struct uprobe_trace_entry_head { - struct trace_entry ent; - unsigned long ip; -}; - /* * trace_flag_type is an enumeration that holds different * states when a trace occurs. These are: diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 43d258d..92a4b08 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -28,6 +28,17 @@ #define UPROBE_EVENT_SYSTEM "uprobes" +struct uprobe_trace_entry_head { + struct trace_entry ent; + unsigned long vaddr[]; +}; + +#define SIZEOF_TRACE_ENTRY(nr) \ + (sizeof(struct uprobe_trace_entry_head) + sizeof(unsigned long) * (nr)) + +#define DATAOF_TRACE_ENTRY(entry, nr) \ + ((void*)&(entry)->vaddr[nr]) + struct trace_uprobe_filter { rwlock_t rwlock; int nr_systemwide; @@ -491,20 +502,19 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs) struct uprobe_trace_entry_head *entry; struct ring_buffer_event *event; struct ring_buffer *buffer; - u8 *data; + void *data; int size, i; struct ftrace_event_call *call = &tu->call; - size = sizeof(*entry) + tu->size; - + size = SIZEOF_TRACE_ENTRY(1) + tu->size; event = trace_current_buffer_lock_reserve(&buffer, call->event.type, size, 0, 0); if (!event) return 0; entry = ring_buffer_event_data(event); - entry->ip = instruction_pointer(regs); - data = (u8 *)&entry[1]; + entry->vaddr[0] = instruction_pointer(regs); + data = DATAOF_TRACE_ENTRY(entry, 1); for (i = 0; i < tu->nr_args; i++) call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset); @@ -518,22 +528,22 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs) static enum print_line_t print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event) { - struct uprobe_trace_entry_head *field; + struct uprobe_trace_entry_head *entry; struct trace_seq *s = &iter->seq; struct trace_uprobe *tu; u8 *data; int i; - field = (struct uprobe_trace_entry_head *)iter->ent; + entry = (struct uprobe_trace_entry_head *)iter->ent; tu = container_of(event, struct trace_uprobe, call.event); - if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name, field->ip)) + if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name, entry->vaddr[0])) goto partial; - data = (u8 *)&field[1]; + data = DATAOF_TRACE_ENTRY(entry, 1); for (i = 0; i < tu->nr_args; i++) { if (!tu->args[i].type->print(s, tu->args[i].name, - data + tu->args[i].offset, field)) + data + tu->args[i].offset, entry)) goto partial; } @@ -585,16 +595,17 @@ static void probe_event_disable(struct trace_uprobe *tu, int flag) static int uprobe_event_define_fields(struct ftrace_event_call *event_call) { - int ret, i; + int ret, i, size; struct uprobe_trace_entry_head field; - struct trace_uprobe *tu = (struct trace_uprobe *)event_call->data; + struct trace_uprobe *tu = event_call->data; - DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); + DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0); + size = SIZEOF_TRACE_ENTRY(1); /* Set argument names as fields */ for (i = 0; i < tu->nr_args; i++) { ret = trace_define_field(event_call, tu->args[i].type->fmttype, tu->args[i].name, - sizeof(field) + tu->args[i].offset, + size + tu->args[i].offset, tu->args[i].type->size, tu->args[i].type->is_signed, FILTER_OTHER); @@ -748,33 +759,31 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs) struct ftrace_event_call *call = &tu->call; struct uprobe_trace_entry_head *entry; struct hlist_head *head; - u8 *data; - int size, __size, i; - int rctx; + unsigned long ip; + void *data; + int size, rctx, i; if (!uprobe_perf_filter(&tu->consumer, 0, current->mm)) return UPROBE_HANDLER_REMOVE; - __size = sizeof(*entry) + tu->size; - size = ALIGN(__size + sizeof(u32), sizeof(u64)); - size -= sizeof(u32); + size = SIZEOF_TRACE_ENTRY(1); + 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 0; preempt_disable(); - entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); if (!entry) goto out; - entry->ip = instruction_pointer(regs); - data = (u8 *)&entry[1]; + ip = instruction_pointer(regs); + entry->vaddr[0] = ip; + data = DATAOF_TRACE_ENTRY(entry, 1); for (i = 0; i < tu->nr_args; i++) call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset); head = this_cpu_ptr(call->perf_events); - perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head, NULL); - + perf_trace_buf_submit(entry, size, rctx, ip, 1, regs, head, NULL); out: preempt_enable(); return 0; @@ -784,7 +793,7 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs) static int trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type, void *data) { - struct trace_uprobe *tu = (struct trace_uprobe *)event->data; + struct trace_uprobe *tu = event->data; switch (type) { case TRACE_REG_REGISTER: -- 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/