From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@amacapital.net>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 3/5 v2] ftrace/x86_32: Add stack frame pointer to ftrace_caller
Date: Thu, 16 Mar 2017 13:20:11 -0400 [thread overview]
Message-ID: <20170316172056.446001663@goodmis.org> (raw)
In-Reply-To: 20170316172008.086705006@goodmis.org
[-- Attachment #1: 0003-ftrace-x86_32-Add-stack-frame-pointer-to-ftrace_call.patch --]
[-- Type: text/plain, Size: 2128 bytes --]
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
The function hook ftrace_caller does not create its own stack frame, and
this causes the ftrace stack trace to miss the first function when doing
stack traces.
# echo schedule:stacktrace > /sys/kernel/tracing/set_ftrace_filter
Before:
<idle>-0 [002] .N.. 29.865807: <stack trace>
=> cpu_startup_entry
=> start_secondary
=> startup_32_smp
<...>-7 [001] .... 29.866509: <stack trace>
=> kthread
=> ret_from_fork
<...>-1 [000] .... 29.865377: <stack trace>
=> poll_schedule_timeout
=> do_select
=> core_sys_select
=> SyS_select
=> do_fast_syscall_32
=> entry_SYSENTER_32
After:
<idle>-0 [002] .N.. 31.234853: <stack trace>
=> do_idle
=> cpu_startup_entry
=> start_secondary
=> startup_32_smp
<...>-7 [003] .... 31.235140: <stack trace>
=> rcu_gp_kthread
=> kthread
=> ret_from_fork
<...>-1819 [000] .... 31.264172: <stack trace>
=> schedule_hrtimeout_range
=> poll_schedule_timeout
=> do_sys_poll
=> SyS_ppoll
=> do_fast_syscall_32
=> entry_SYSENTER_32
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
arch/x86/kernel/ftrace_32.S | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/ftrace_32.S b/arch/x86/kernel/ftrace_32.S
index 4ff30f31f0a5..6f855dfb786d 100644
--- a/arch/x86/kernel/ftrace_32.S
+++ b/arch/x86/kernel/ftrace_32.S
@@ -17,12 +17,19 @@ ENTRY(mcount)
END(mcount)
ENTRY(ftrace_caller)
+
+ pushl %ebp
+ movl %esp, %ebp
+
pushl %eax
pushl %ecx
pushl %edx
pushl $0 /* Pass NULL as regs pointer */
- movl 4*4(%esp), %eax
- movl 0x4(%ebp), %edx
+ movl 5*4(%esp), %eax
+ /* Copy original ebp into %edx */
+ movl 4*4(%esp), %edx
+ /* Get the parent ip */
+ movl 0x4(%edx), %edx
movl function_trace_op, %ecx
subl $MCOUNT_INSN_SIZE, %eax
@@ -34,6 +41,7 @@ ftrace_call:
popl %edx
popl %ecx
popl %eax
+ popl %ebp
.Lftrace_ret:
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl ftrace_graph_call
--
2.10.2
next prev parent reply other threads:[~2017-03-16 17:22 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-16 17:20 [PATCH 0/5 v2] ftrace/x86_32: Ftrace cleanup and add support for -mfentry Steven Rostedt
2017-03-16 17:20 ` [PATCH 1/5 v2] x86/ftrace: Rename mcount_64.S to ftrace_64.S Steven Rostedt
2017-03-16 17:20 ` [PATCH 2/5 v2] ftrace/x86-32: Move the ftrace specific code out of entry_32.S Steven Rostedt
2017-03-17 13:21 ` Steven Rostedt
2017-03-16 17:20 ` Steven Rostedt [this message]
2017-03-16 17:20 ` [PATCH 4/5 v2] ftrace/x86_32: Clean up ftrace_regs_caller Steven Rostedt
2017-03-16 17:40 ` Linus Torvalds
2017-03-16 17:55 ` Steven Rostedt
2017-03-16 18:09 ` [PATCH 4/5 v3] " Steven Rostedt
2017-03-16 18:19 ` Linus Torvalds
2017-03-16 19:19 ` Steven Rostedt
2017-03-16 19:24 ` Steven Rostedt
2017-03-16 19:30 ` Linus Torvalds
2017-03-16 19:50 ` Steven Rostedt
2017-03-16 19:28 ` Linus Torvalds
2017-03-16 19:49 ` Steven Rostedt
2017-03-16 20:14 ` [PATCH 4/5 v3.1] " Steven Rostedt
2017-03-16 17:20 ` [PATCH 5/5 v2] ftrace/x86-32: Add -mfentry support to x86_32 with DYNAMIC_FTRACE set Steven Rostedt
2017-03-16 20:40 ` [PATCH 5/5 v3] " Steven Rostedt
2017-03-16 21:00 ` Josh Poimboeuf
2017-03-16 21:25 ` Steven Rostedt
2017-03-17 10:38 ` Masami Hiramatsu
2017-03-23 14:33 [PATCH 0/6 v5] [GIT PULL] ftrace/x86: Ftrace cleanup and add support for -mfentry on x86_32 Steven Rostedt
2017-03-23 14:33 ` [PATCH 1/6 v5] ftrace/x86_64: Rename mcount_64.S to ftrace_64.S Steven Rostedt
2017-03-24 9:19 ` [tip:x86/asm] x86/ftrace: " tip-bot for Steven Rostedt (VMware)
2017-03-23 14:33 ` [PATCH 2/6 v5] ftrace/x86_32: Move the ftrace specific code out of entry_32.S Steven Rostedt
2017-03-23 18:19 ` Thomas Gleixner
2017-03-23 19:03 ` Steven Rostedt
2017-03-24 9:20 ` [tip:x86/asm] x86/ftrace: " tip-bot for Steven Rostedt (VMware)
2017-03-23 14:33 ` [PATCH 3/6 v5] ftrace/x86_32: Add stack frame pointer to ftrace_caller Steven Rostedt
2017-03-24 9:20 ` [tip:x86/asm] x86/ftrace: " tip-bot for Steven Rostedt (VMware)
2017-03-23 14:33 ` [PATCH 4/6 v5] ftrace/x86_32: Clean up ftrace_regs_caller Steven Rostedt
2017-03-24 9:21 ` [tip:x86/asm] x86/ftrace: " tip-bot for Steven Rostedt (VMware)
2017-03-23 14:33 ` [PATCH 5/6 v5] ftrace/x86_32: Add -mfentry support to x86_32 with DYNAMIC_FTRACE set Steven Rostedt
2017-03-24 9:21 ` [tip:x86/asm] x86/ftrace: " tip-bot for Steven Rostedt (VMware)
2017-03-23 14:33 ` [PATCH 6/6 v5] ftrace/x86: Use Makefile logic instead of #ifdef for compiling ftrace_*.o Steven Rostedt
2017-03-24 9:22 ` [tip:x86/asm] x86/ftrace: " tip-bot for Steven Rostedt (VMware)
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