kernel/tools/perf/util/probe-finder.h, branch linux-4.3.y

perf probe: Introduce probe_conf global configs

2015-05-08T19:26:26Z

Introduce probe_conf global configuration parameters for probe-event and probe-finder, and removes related parameters from APIs. Signed-off-by: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: David Ahern Cc: Hemant Kumar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20150508010330.24812.21095.stgit@localhost.localdomain Signed-off-by: Arnaldo Carvalho de Melo

perf probe: Support $params special probe argument

2015-05-08T19:05:03Z

$params is similar to $vars but matches only function parameters not local variables. Thus, this is useful for tracing function parameter changing or tracing function call with parameters. Testing it: # perf probe tcp_sendmsg '$params' Added new event: probe:tcp_sendmsg (on tcp_sendmsg with $params) You can now use it in all perf tools, such as: perf record -e probe:tcp_sendmsg -aR sleep 1 # perf probe -l probe:tcp_sendmsg (on tcp_sendmsg@acme/git/linux/net/ipv4/tcp.c with iocb sk msg size) # perf record -a -e probe:* press some random letters to generate TCP (sshd) traffic... ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.223 MB perf.data (6 samples) ] # perf script sshd 6385 [2] 3.907529: probe:tcp_sendmsg: iocb=0xffff8800ac4cfe70 sk=0xffff88042196c140 msg=0xffff8800ac4cfda8 size=0x24 sshd 6385 [2] 4.138973: probe:tcp_sendmsg: iocb=0xffff8800ac4cfe70 sk=0xffff88042196c140 msg=0xffff8800ac4cfda8 size=0x24 sshd 6385 [2] 4.378966: probe:tcp_sendmsg: iocb=0xffff8800ac4cfe70 sk=0xffff88042196c140 msg=0xffff8800ac4cfda8 size=0x24 sshd 6385 [2] 4.603681: probe:tcp_sendmsg: iocb=0xffff8800ac4cfe70 sk=0xffff88042196c140 msg=0xffff8800ac4cfda8 size=0x24 sshd 6385 [2] 4.818455: probe:tcp_sendmsg: iocb=0xffff8800ac4cfe70 sk=0xffff88042196c140 msg=0xffff8800ac4cfda8 size=0x24 sshd 6385 [2] 5.043603: probe:tcp_sendmsg: iocb=0xffff8800ac4cfe70 sk=0xffff88042196c140 msg=0xffff8800ac4cfda8 size=0x24 # cat /sys/kernel/debug/tracing/events/probe/tcp_sendmsg/format name: tcp_sendmsg ID: 1927 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1; field:unsigned long __probe_ip; offset:8; size:8; signed:0; field:u64 iocb; offset:16; size:8; signed:0; field:u64 sk; offset:24; size:8; signed:0; field:u64 msg; offset:32; size:8; signed:0; field:u64 size; offset:40; size:8; signed:0; print fmt: "(%lx) iocb=0x%Lx sk=0x%Lx msg=0x%Lx size=0x%Lx", REC->__probe_ip, REC->iocb, REC->sk, REC->msg, REC->size # Do some system wide tracing of this probe + write syscalls: # perf trace -e write --ev probe:* --filter-pids 6385 462.612 (0.010 ms): bash/19153 write(fd: 1, buf: 0x7f7556c78000, count: 29 ) = 29 462.701 (0.027 ms): sshd/19152 write(fd: 3, buf: 0x7f78dd12e160, count: 68 ) ... 462.701 ( ): probe:tcp_sendmsg:(ffffffff8163db30) iocb=0xffff8803ebec7e70 sk=0xffff88042196ab80 msg=0xffff8803ebec7da8 size=0x44) 462.710 (0.035 ms): sshd/19152 ... [continued]: write()) = 68 462.787 (0.009 ms): bash/19153 write(fd: 2, buf: 0x7f7556c77000, count: 22 ) = 22 462.865 (0.002 ms): sshd/19152 write(fd: 3, buf: 0x7f78dd12e160, count: 68 ) ... 462.865 ( ): probe:tcp_sendmsg:(ffffffff8163db30) iocb=0xffff8803ebec7e70 sk=0xffff88042196ab80 msg=0xffff8803ebec7da8 size=0x44) 462.873 (0.010 ms): sshd/19152 ... [continued]: write()) = 68 Signed-off-by: Masami Hiramatsu Tested-by: Arnaldo Carvalho de Melo Cc: Ananth N Mavinakayanahalli Cc: David Ahern Cc: Hemant Kumar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20150506124653.4961.59806.stgit@localhost.localdomain [ Add some examples to the changelog message showing how to use it ] Signed-off-by: Arnaldo Carvalho de Melo

perf probe: Find compilation directory path for lazy matching

2015-04-13T23:11:05Z

If we use lazy matching, it failed to open a souce file if perf command is invoked outside of compilation directory: $ perf probe -a '__schedule;clear_*' Failed to open kernel/sched/core.c: No such file or directory Error: Failed to add events. (-2) OTOH, other commands like "probe -L" can solve the souce directory by themselves. Let's make it possible for lazy matching too! Signed-off-by: Naohiro Aota Acked-by: Masami Hiramatsu Cc: He Kuang Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1426223923-1493-1-git-send-email-naota@elisp.net Signed-off-by: Arnaldo Carvalho de Melo

perf probe: Support distro-style debuginfo for uprobe

2014-02-18T12:38:44Z

Support distro-style debuginfo supported by dso for setting uprobes. Note that this tries to find a debuginfo file based on the real path of the target binary. If the debuginfo is not correctly installed on the system, this can not find it. Signed-off-by: Masami Hiramatsu Cc: David Ahern Cc: "David A. Long" Cc: Ingo Molnar Cc: Namhyung Kim Cc: Oleg Nesterov Cc: Srikar Dronamraju Cc: Steven Rostedt Cc: yrl.pp-manager.tt@hitachi.com Link: http://lkml.kernel.org/r/20140206053227.29635.54434.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp Signed-off-by: Arnaldo Carvalho de Melo

perf probe: Find given address from offline dwarf

2014-02-18T12:34:51Z

Find the given address from offline dwarfs instead of online kernel dwarfs. On the KASLR enabled kernel, the kernel text section is loaded with random offset, and the debuginfo__new_online_kernel can't handle it. So let's move to the offline dwarf loader instead of using the online dwarf loader. As a result, since we don't need debuginfo__new_online_kernel any more, this also removes the functions related to that. Without this change; # ./perf probe -l probe:t_show (on _stext+901288 with m v) probe:t_show_1 (on _stext+939624 with m v t) probe:t_show_2 (on _stext+980296 with m v fmt) probe:t_show_3 (on _stext+1014392 with m v file) With this change; # ./perf probe -l probe:t_show (on t_show@linux-3/kernel/trace/ftrace.c with m v) probe:t_show_1 (on t_show@linux-3/kernel/trace/trace.c with m v t) probe:t_show_2 (on t_show@kernel/trace/trace_printk.c with m v fmt) probe:t_show_3 (on t_show@kernel/trace/trace_events.c with m v file) Changes from v2: - Instead of retrying, directly opens offline dwarf. - Remove debuginfo__new_online_kernel and related functions. - Refer map->reloc to get the correct address of a symbol. - Add a special case for handling ref_reloc_sym based address. Signed-off-by: Masami Hiramatsu Cc: David Ahern Cc: "David A. Long" Cc: Ingo Molnar Cc: Namhyung Kim Cc: Oleg Nesterov Cc: Srikar Dronamraju Cc: Steven Rostedt Cc: yrl.pp-manager.tt@hitachi.com Link: http://lkml.kernel.org/r/20140206053218.29635.74821.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp Signed-off-by: Arnaldo Carvalho de Melo

perf probe: Replace line_list with intlist

2014-02-18T12:34:50Z

Replace line_list (struct line_node) with intlist for reducing similar codes. Signed-off-by: Masami Hiramatsu Acked-by: Namhyung Kim Cc: David Ahern Cc: "David A. Long" Cc: Ingo Molnar Cc: Namhyung Kim Cc: Oleg Nesterov Cc: Srikar Dronamraju Cc: Steven Rostedt Cc: yrl.pp-manager.tt@hitachi.com Link: http://lkml.kernel.org/r/20140206053209.29635.81043.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Finish the removal of 'self' arguments

2013-11-05T18:32:36Z

They convey no information, perhaps I was bitten by some snake at some point, complete the detox by naming the last of those arguments more sensibly. Cc: Adrian Hunter Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-u1r0dnjoro08dgztiy2g3t2q@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf probe: Support "$vars" meta argument syntax for local variables

2013-10-23T12:55:37Z

Support "$vars" meta argument syntax for tracing all local variables at probe point. Now you can trace all available local variables (including function parameters) at the probe point by passing $vars. # perf probe --add foo $vars This automatically finds all local variables at foo() and adds it as probe arguments. Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20131011071023.15557.51770.stgit@udc4-manage.rcp.hitachi.co.jp Signed-off-by: Arnaldo Carvalho de Melo

tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT

2013-10-09T06:48:28Z

Standardize all the feature flags based on the HAVE_{FEATURE}_SUPPORT naming convention: HAVE_ARCH_X86_64_SUPPORT HAVE_BACKTRACE_SUPPORT HAVE_CPLUS_DEMANGLE_SUPPORT HAVE_DWARF_SUPPORT HAVE_ELF_GETPHDRNUM_SUPPORT HAVE_GTK2_SUPPORT HAVE_GTK_INFO_BAR_SUPPORT HAVE_LIBAUDIT_SUPPORT HAVE_LIBELF_MMAP_SUPPORT HAVE_LIBELF_SUPPORT HAVE_LIBNUMA_SUPPORT HAVE_LIBUNWIND_SUPPORT HAVE_ON_EXIT_SUPPORT HAVE_PERF_REGS_SUPPORT HAVE_SLANG_SUPPORT HAVE_STRLCPY_SUPPORT Cc: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: Namhyung Kim Cc: David Ahern Cc: Jiri Olsa Link: http://lkml.kernel.org/n/tip-u3zvqejddfZhtrbYbfhi3spa@git.kernel.org Signed-off-by: Ingo Molnar

perf probe: Fix probing symbols with optimization suffix

2013-09-25T15:27:31Z

Fix perf probe to probe on some symbols which have some optimzation suffixes, e.g. ".part", ".isra", and ".constprop". To fix this issue, instead of using the DIE name, perf probe uses the symbol name found by dwfl_module_addrsym(). This also involves a perf probe --vars operation update which now shows the symbol name instead of the DIE name. Without this patch, putting a probe on an inlined function which was compiled with a suffixed symbol will fail like this: $ perf probe -v getname_flags probe-definition(0): getname_flags symbol:getname_flags file:(null) line:0 offset:0 return:0 lazy:(null) 0 arguments Looking at the vmlinux_path (6 entries long) Using /lib/modules/3.11.0+/build/vmlinux for symbols found inline addr: 0xffffffff8119bb70 Probe point found: getname_flags+0 found inline addr: 0xffffffff8119bcb6 Probe point found: getname+6 found inline addr: 0xffffffff811a06a6 Probe point found: user_path_at_empty+6 find 3 probe_trace_events. Opening /sys/kernel/debug//tracing/kprobe_events write=1 Added new events: Writing event: p:probe/getname_flags getname_flags+0 Failed to write event: No such file or directory Error: Failed to add events. (-1) Because the debuginfo knows only the original (non suffix) symbol name, it uses the original symbol for probe address but the kernel (kallsyms) knows only suffixed symbol. Then, the kernel rejects that original symbol. This patch uses dwfl_module_addrsym() to get the correct (suffixed) symbol from symtab when a probe point is found. Reported-by: Arnaldo Carvalho de Melo Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20130925131616.31632.46658.stgit@udc4-manage.rcp.hitachi.co.jp Signed-off-by: Arnaldo Carvalho de Melo