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ftrace: Add recording of functions that caused recursion

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This adds CONFIG_FTRACE_RECORD_RECURSION that will record to a file
"recursed_functions" all the functions that caused recursion while a
callback to the function tracer was running.

Link: https://lkml.kernel.org/r/20201106023548.102375687@goodmis.org

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Guo Ren <guoren@kernel.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-csky@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Cc: live-patching@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2020-11-05 21:32:46 -05:00
parent a25d036d93
commit 773c167050
17 changed files with 306 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

29
include/linux/trace_recursion.h
View file

@ -91,6 +91,9 @@ enum {
* not be correct. Allow for a single recursion to cover this case.
*/
TRACE_TRANSITION_BIT,
/* Used to prevent recursion recording from recursing. */
TRACE_RECORD_RECURSION_BIT,
};
#define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
@ -142,7 +145,22 @@ static __always_inline int trace_get_context_bit(void)
pc & HARDIRQ_MASK ? TRACE_CTX_IRQ : TRACE_CTX_SOFTIRQ;
}
static __always_inline int trace_test_and_set_recursion(int start, int max)
#ifdef CONFIG_FTRACE_RECORD_RECURSION
extern void ftrace_record_recursion(unsigned long ip, unsigned long parent_ip);
# define do_ftrace_record_recursion(ip, pip) \
do { \
if (!trace_recursion_test(TRACE_RECORD_RECURSION_BIT)) { \
trace_recursion_set(TRACE_RECORD_RECURSION_BIT); \
ftrace_record_recursion(ip, pip); \
trace_recursion_clear(TRACE_RECORD_RECURSION_BIT); \
} \
} while (0)
#else
# define do_ftrace_record_recursion(ip, pip) do { } while (0)
#endif
static __always_inline int trace_test_and_set_recursion(unsigned long ip, unsigned long pip,
int start, int max)
{
unsigned int val = current->trace_recursion;
int bit;
@ -158,8 +176,10 @@ static __always_inline int trace_test_and_set_recursion(int start, int max)
* a switch between contexts. Allow for a single recursion.
*/
bit = TRACE_TRANSITION_BIT;
if (trace_recursion_test(bit))
if (trace_recursion_test(bit)) {
do_ftrace_record_recursion(ip, pip);
return -1;
}
trace_recursion_set(bit);
barrier();
return bit + 1;
@ -199,9 +219,10 @@ static __always_inline void trace_clear_recursion(int bit)
* Returns: -1 if a recursion happened.
* >= 0 if no recursion
*/
static __always_inline int ftrace_test_recursion_trylock(void)
static __always_inline int ftrace_test_recursion_trylock(unsigned long ip,
unsigned long parent_ip)
{
return trace_test_and_set_recursion(TRACE_FTRACE_START, TRACE_FTRACE_MAX);
return trace_test_and_set_recursion(ip, parent_ip, TRACE_FTRACE_START, TRACE_FTRACE_MAX);
}
/**