01 Mar, 2010
1 commit
-
…git/tip/linux-2.6-tip
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (172 commits)
perf_event, amd: Fix spinlock initialization
perf_event: Fix preempt warning in perf_clock()
perf tools: Flush maps on COMM events
perf_events, x86: Split PMU definitions into separate files
perf annotate: Handle samples not at objdump output addr boundaries
perf_events, x86: Remove superflous MSR writes
perf_events: Simplify code by removing cpu argument to hw_perf_group_sched_in()
perf_events, x86: AMD event scheduling
perf_events: Add new start/stop PMU callbacks
perf_events: Report the MMAP pgoff value in bytes
perf annotate: Defer allocating sym_priv->hist array
perf symbols: Improve debugging information about symtab origins
perf top: Use a macro instead of a constant variable
perf symbols: Check the right return variable
perf/scripts: Tag syscall_name helper as not yet available
perf/scripts: Add perf-trace-python Documentation
perf/scripts: Remove unnecessary PyTuple resizes
perf/scripts: Add syscall tracing scripts
perf/scripts: Add Python scripting engine
perf/scripts: Remove check-perf-trace from listed scripts
...Fix trivial conflict in tools/perf/util/probe-event.c
26 Feb, 2010
3 commits
-
Even though we don't register the counters until the child is right about
to exec(), we're still going to get at least a few events while the
fork()'d child is still executing 'perf' and in particular we're going to
get the MMAP events.We can't distinguish the ones in the newly executed process because the
PID will be the same.One way to solve this would be to have a PERF_RECORD_EXEC event, and when
this is seen 'perf' can flush it's map cache. We can't use
PERF_RECORD_COMM since that's generated by other things, not just exec().Actually, thinking about it some more, using PERF_RECORD_COMM might be a
good enough approximation.Signed-off-by: David S. Miller
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
Without this patch we get this for need_resched:
[root@mica ~]# perf annotate need_resched
------------------------------------------------
Percent | Source code & Disassembly of vmlinux
------------------------------------------------
:
:
: Disassembly of section .text:
:
: ffffffff810095ed :
: return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
: }
:
: static inline int need_resched(void)
: {
0.00 : ffffffff810095ed: 55 push %rbp
: return unlikely(test_thread_flag(TIF_NEED_RESCHED));
0.00 : ffffffff810095ee: be 03 00 00 00 mov $0x3,%esi
:
: static inline struct thread_info *current_thread_info(void)
: {
: struct thread_info *ti;
: ti = (void *)(percpu_read_stable(kernel_stack) +
0.00 : ffffffff810095f3: 65 48 8b 3c 25 48 b5 mov %gs:0xb548,%rdi
0.00 : ffffffff810095fa: 00 00
: return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
: }
:
: static inline int need_resched(void)
: {
0.00 : ffffffff810095fc: 48 89 e5 mov %rsp,%rbp
: return unlikely(test_thread_flag(TIF_NEED_RESCHED));
0.00 : ffffffff810095ff: 48 81 ef d8 1f 00 00 sub $0x1fd8,%rdi
0.00 : ffffffff81009606: e8 9d ff ff ff callq ffffffff810095a8
: }
0.00 : ffffffff8100960b: c9 leaveq
0.00 : ffffffff8100960c: 85 c0 test %eax,%eax
0.00 : ffffffff8100960e: 0f 95 c0 setne %al
0.00 : ffffffff81009611: 0f b6 c0 movzbl %al,%eax
: Disassembly of section .vsyscall_0:
: Disassembly of section .vsyscall_fn:
: Disassembly of section .vsyscall_1:
: Disassembly of section .vsyscall_2:
: Disassembly of section .init.text:
: Disassembly of section .altinstr_replacement:
: Disassembly of section .exit.text:
[root@mica ~]#But from the 'perf report' result we know that there are hits
for need_resched on a 4 way machine mostly doing nothing, so
after adding code to show what is in each hist offset and
collapsing IP hits for what happens between objdump lines we
get, for the same perf.data file:[root@mica ~]# perf annotate -v need_resched
------------------------------------------------
Percent | Source code & Disassembly of vmlinux
------------------------------------------------
:
:
: Disassembly of section .text:
:
: ffffffff810095ed :
: return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
: }
:
: static inline int need_resched(void)
: {
0.00 : ffffffff810095ed: 55 push %rbp
: return unlikely(test_thread_flag(TIF_NEED_RESCHED));
52.78 : ffffffff810095ee: be 03 00 00 00 mov $0x3,%esi
:
: static inline struct thread_info *current_thread_info(void)
: {
: struct thread_info *ti;
: ti = (void *)(percpu_read_stable(kernel_stack) +
0.00 : ffffffff810095f3: 65 48 8b 3c 25 48 b5 mov %gs:0xb548,%rdi
0.00 : ffffffff810095fa: 00 00
: return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
: }
:
: static inline int need_resched(void)
: {
0.00 : ffffffff810095fc: 48 89 e5 mov %rsp,%rbp
: return unlikely(test_thread_flag(TIF_NEED_RESCHED));
9.72 : ffffffff810095ff: 48 81 ef d8 1f 00 00 sub $0x1fd8,%rdi
0.00 : ffffffff81009606: e8 9d ff ff ff callq ffffffff810095a8
: }
0.00 : ffffffff8100960b: c9 leaveq
0.00 : ffffffff8100960c: 85 c0 test %eax,%eax
37.50 : ffffffff8100960e: 0f 95 c0 setne %al
0.00 : ffffffff81009611: 0f b6 c0 movzbl %al,%eax
: Disassembly of section .vsyscall_0:
: Disassembly of section .vsyscall_fn:
: Disassembly of section .vsyscall_1:
: Disassembly of section .vsyscall_2:
: Disassembly of section .init.text:
: Disassembly of section .altinstr_replacement:
: Disassembly of section .exit.text:
[root@mica ~]#And now 'perf annotate -v', verbose mode, will show the hits per
precise IP, so that one can make sense of the attribution to
each objdumop line:[root@mica ~]# perf annotate -v need_resched
Looking at the vmlinux_path (5 entries long)
Using /lib/modules/2.6.33-rc8-tip-00784-g3471df5-dirty/build/vmlinux
for symbols annotate_sym: filename=/lib/modules/2.6.33-rc8-tip-00784-g3471df5-dirty/build/vmlinux, sym=need_resched, start=0xffffffff810095ed, end=0xffffffff81009614------------------------------------------------
Percent | Source code & Disassembly of vmlinux
------------------------------------------------
ffffffff810095f1: 152
ffffffff81009603: 28
ffffffff8100960f: 55
ffffffff81009610: 53
h->sum: 288Signed-off-by: Arnaldo Carvalho de Melo
Cc: David Miller
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
Because symbol->end is not fixed up at symbol_filter time, only
after all symbols for a DSO are loaded, and that, for asm
symbols, may be bogus, causing segfaults when hits happen in
these symbols.Reported-by: David Miller
Reported-by: Anton Blanchard
Acked-by: David Miller
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: # for .33.x. Does not apply cleanly, needs backport.
LKML-Reference:
Signed-off-by: Ingo Molnar
25 Feb, 2010
8 commits
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Be more clear about DSO long names and tell from which file
kernel symbols were obtained, all in --verbose mode:[root@mica ~]# perf report -v > /dev/null
Looking at the vmlinux_path (5 entries long)
Using /lib/modules/2.6.33-rc8-tip-00777-g0918527-dirty/build/vmlinux for symbols
[root@mica ~]# mv /lib/modules/2.6.33-rc8-tip-00777-g0918527-dirty/build/vmlinux /tmp/dd
[root@mica ~]# perf report -v > /dev/null
Looking at the vmlinux_path (5 entries long)
Using /proc/kallsyms for symbols
[root@mica ~]#Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
To overcome a silly gcc warning:
cc1: warnings being treated as errors
builtin-top.c: In function ‘lookup_sym_source’:
builtin-top.c:291: warning: not protecting local variables:
variable length buffer make: *** [builtin-top.o] Error 1
make: *** Waiting for unfinished jobs....That is emitted for this:
const size_t pattern_len = BITS_PER_LONG / 4 + 2;
char pattern[pattern_len + 1];Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
[ -v2: macroify the naming style ]
Signed-off-by: Ingo Molnar -
In function dso__split_kallsyms(), curr_map saves the return value
of map__new2. So check it instead of var map after the call returns.Signed-off-by: Zhang Yanmin
Acked-by: David S. Miller
Cc: # for .33.x
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar -
syscall_name() helper, which resolves a syscall arch number to
its name, is not yet available as we first need to implement
event injection for it to work.Remove it from the documentation or tag its references as
unavailable yet. Once it's implemented, we can just revert
the current patch.Signed-off-by: Frederic Weisbecker
Cc: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo -
Also small update to perf-trace-perl and perf-trace docs.
Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
If we know the size of a tuple in advance, there's no need to resize
it - start out with the known size in the first place.Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
Adds a set of scripts that aggregate system call totals and system
call errors. Most are Python scripts that also test basic
functionality of the new Python engine, but there's also one Perl
script added for comparison and for reference in some new
Documentation contained in a later patch.Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
Add base support for Python scripting to perf trace.
Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker
24 Feb, 2010
5 commits
-
The check-perf-trace script only checks Perl functionality, and
doesn't really need to be listed as as user script anyway.This only removes the '-report' shell script, so although it doesn't
appear in the listing, the '-record' shell script and the check perf
trace perl script itself is still available and can still be run
manually as such:$ libexec/perf-core/scripts/perl/bin/check-perf-trace-record
$ perf trace -s libexec/perf-core/scripts/perl/check-perf-trace.plSigned-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
Create a scripting-engines directory to contain scripting engine
implementation code, in anticipation of the addition of new scripting
support. Also removes trace-event-perl.h.Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
This stuff is needed by all scripting engines; move it from the Perl
engine source to a more common place.Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
Fix bogus calculation.
Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker -
'perf trace -s list' prints a list of the supported scripting
languages. One problem with it is that it falls through and prints
the trace as well. The use of 'list' for this also makes it easy to
confuse with 'perf trace -l', used for listing available scripts. So
change 'perf trace -s list' to 'perf trace -s lang' and fixes the
fall-through problem.Signed-off-by: Tom Zanussi
Cc: Ingo Molnar
Cc: Steven Rostedt
Cc: Keiichi KII
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
LKML-Reference:
Signed-off-by: Frederic Weisbecker
22 Feb, 2010
3 commits
-
Clear struct probe_point before using it in
show_perf_probe_events(), and set pp->found counter correctly in
synthesize_perf_probe_point(). Without this initialization,
clear_probe_point() will free random addresses.Signed-off-by: Masami Hiramatsu
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
Cc: systemtap
Cc: DLE
LKML-Reference:
Signed-off-by: Ingo Molnar -
As the parent comm then is worthless, confusing users about the
thread where the sample really happened, leading to think that
the sample happened in the parent, not where it really happened,
in the children of a thread for which a PERF_RECORD_COMM event
was not received.Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
In 2161db9 we stopped failing when not finding modules when
asked too, but then the kernel maps (just one, for vmlinux)
wasn't having its ->end field correctly set up, so symbols were
not being found for the vmlinux map because its range was 0-0.Reported-by: Ingo Molnar
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar
14 Feb, 2010
1 commit
-
Print this:
Mapped keys:
[d] display refresh delay. (2)
[e] display entries (lines). (46)
[f] profile display filter (count). (5)
[F] annotate display filter (percent). (5%)
[s] annotate symbol. (NULL)
[S] stop annotation.
[K] hide kernel_symbols symbols. (no)
[U] hide user symbols. (no)
[z] toggle sample zeroing. (0)
[qQ] quit.instead of:
Mapped keys:
[d] display refresh delay. (2)
[e] display entries (lines). (46)
[f] profile display filter (count). (5)
[F] annotate display filter (percent). (5%)
[s] annotate symbol. (NULL)
[S] stop annotation.
[K] hide kernel_symbols symbols. (no)
[U] hide user symbols. (no)
[z] toggle sample zeroing. (0)
[qQ] quit.Signed-off-by: Kirill Smelkov
Acked-by: Arnaldo Carvalho de Melo
Cc: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar
09 Feb, 2010
1 commit
-
cpumode bits are defined as such:
#define PERF_RECORD_MISC_KERNEL (1 << 0)
#define PERF_RECORD_MISC_USER (2 << 0)
#define PERF_RECORD_MISC_HYPERVISOR (3 << 0)We need to compare against the complete value of cpumode,
otherwise hypervisor samples get incorrectly attributed as
userspace.Signed-off-by: Anton Blanchard
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
Cc: fweisbec@gmail.com
LKML-Reference:
Signed-off-by: Ingo Molnar
08 Feb, 2010
3 commits
-
When 'perf record -g' a existing process, even with debuginfo
packages, still cannnot get symbol from 'perf report'.try:
perf record -g -p `pidof xxx` -f
perf report68.26% :1181 b74870f2 [.] 0x000000b74870f2
|
|--32.09%-- 0xb73b5b44
| 0xb7487102
| 0xb748a4e2
| 0xb748633d
| 0xb73b41cd
| 0xb73b4467
| 0xb747d531The reason is: for existing process, in __cmd_record(),
the pid is 0 rather than the existing process id.Signed-off-by: Austin Zhang
Acked-by: Peter Zijlstra
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar -
Because we may have aliases, like __GI___strcoll_l in
/lib64/libc-2.10.2.so that appears in objdump as:$ objdump --start-address=0x0000003715a86420 \
--stop-address=0x0000003715a872dc -dS /lib64/libc-2.10.2.so0000003715a86420 :
3715a86420: 55 push %rbp
3715a86421: 48 89 e5 mov %rsp,%rbp
3715a86424: 41 57 push %r15
[root@doppio linux-2.6-tip]#So look for the address exactly at the start of the line instead
so that annotation can work for in these cases.Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Kirill Smelkov
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
First, for programs and prelinked libraries, annotate code was
fooled by objdump output IPs (src->eip in the code) being
wrongly converted to absolute IPs. In such case there were no
conversion needed, but insrc->eip = strtoull(src->line, NULL, 16);
src->eip = map->unmap_ip(map, src->eip); // = eip + map->start - map->pgoffwe were reading absolute address from objdump (e.g. 8048604) and
then almost doubling it, because eip & map->start are
approximately close for small programs.Needless to say, that later, in record_precise_ip() there was no
matching with real runtime IPs.And second, like with `perf annotate` the problem with
non-prelinked *.so was that we were doing rip -> objdump address
conversion wrong.Also, because unlike `perf annotate`, `perf top` code does
annotation based on absolute IPs for performance reasons(*), new
helper for mapping objdump addresse to IP is introduced.(*) we get samples info in absolute IPs, and since we do lots of
hit-testing on absolute IPs at runtime in record_precise_ip(), it's
better to convert objdump addresses to IPs once and do no conversion
at runtime.I also had to fix how objdump output is parsed (with hardcoded
8/16 characters format, which was inappropriate for ET_DYN dsos
with small addresses like '4ac')Also note, that not all objdump output lines has associtated
IPs, e.g. look at source lines here:000004ac :
extern "C"
int my_strlen(const char *s)
4ac: 55 push %ebp
4ad: 89 e5 mov %esp,%ebp
4af: 83 ec 10 sub $0x10,%esp
{
int len = 0;
4b2: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%ebp)
4b9: eb 08 jmp 4c3while (*s) {
++len;
4bb: 83 45 fc 01 addl $0x1,-0x4(%ebp)
++s;
4bf: 83 45 08 01 addl $0x1,0x8(%ebp)So we mark them with eip=0, and ignore such lines in annotate
lookup code.Signed-off-by: Kirill Smelkov
[ Note: one hunk of this patch was applied by Mike in 57d8188 ]
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Mike Galbraith
LKML-Reference:
Signed-off-by: Ingo Molnar
04 Feb, 2010
12 commits
-
perf top and perf record refuses to initialize on non-modular kernels:
refuse to initialize:$ perf top -v
map_groups__set_modules_path_dir: cannot open /lib/modules/2.6.33-rc6-tip-00586-g398dde3-dirty/Cc: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
Setting _FILE_OFFSET_BITS and using O_LARGEFILE, lseek64, etc,
is redundant. Thanks H. Peter Anvin for pointing it out.So, this patch removes O_LARGEFILE, lseek64, etc.
Suggested-by: "H. Peter Anvin"
Signed-off-by: Xiao Guangrong
Cc: Frederic Weisbecker
Cc: Steven Rostedt
Cc: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Signed-off-by: Mike Galbraith
Cc: Kirill Smelkov
Cc: Arnaldo Carvalho de Melo
Cc: Arnaldo Carvalho de Melo
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar -
By relying on logic in dso__load_kernel_sym(), we can
automatically load vmlinux.The only thing which needs to be adjusted, is how --sym-annotate
option is handled - now we can't rely on vmlinux been loaded
until full successful pass of dso__load_vmlinux(), but that's
not the case if we'll do sym_filter_entry setup in
symbol_filter().So move this step right after event__process_sample() where we
know the whole dso__load_kernel_sym() pass is done.By the way, though conceptually similar `perf top` still can't
annotate userspace - see next patches with fixes.Signed-off-by: Kirill Smelkov
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Mike Galbraith
LKML-Reference:
Signed-off-by: Ingo Molnar -
The problem was we were incorrectly calculating objdump
addresses for sym->start and sym->end, look:For simple ET_DYN type DSO (*.so) with one function, objdump -dS
output is something like this:000004ac :
int my_strlen(const char *s)
4ac: 55 push %ebp
4ad: 89 e5 mov %esp,%ebp
4af: 83 ec 10 sub $0x10,%esp
{i.e. we have relative-to-dso-mapping IPs (=RIP) there.
For ET_EXEC type and probably for prelinked libs as well (sorry
can't test - I don't use prelink) objdump outputs absolute IPs,
e.g.08048604 :
extern "C"
int zz_strlen(const char *s)
8048604: 55 push %ebp
8048605: 89 e5 mov %esp,%ebp
8048607: 83 ec 10 sub $0x10,%esp
{So, if sym->start is always relative to dso mapping(*), we'll
have to unmap it for ET_EXEC like cases, and leave as is for
ET_DYN cases.(*) and it is - we've explicitely made it relative. Look for
adjust_symbols handling in dso__load_sym()Previously we were always unmapping sym->start and for ET_DYN
dsos resulting addresses were wrong, and so objdump output was
empty.The end result was that perf annotate output for symbols from
non-prelinked *.so had always 0.00% percents only, which is
wrong.To fix it, let's introduce a helper for converting rip to
objdump address, and also let's document what map_ip() and
unmap_ip() do -- I had to study sources for several hours to
understand it.Signed-off-by: Kirill Smelkov
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Mike Galbraith
LKML-Reference:
Signed-off-by: Ingo Molnar -
Not to pollute too much 'perf annotate' debugging sessions.
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
We want to stream events as fast as possible to perf.data, and
also in the future we want to have splice working, when no
interception will be possible.Using build_id__mark_dso_hit_ops to create the list of DSOs that
back MMAPs we also optimize disk usage in the build-id cache by
only caching DSOs that had hits.Suggested-by: Peter Zijlstra
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Xiao Guangrong
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
Because 'perf record' will have to find the build-ids in after
we stop recording, so as to reduce even more the impact in the
workload while we do the measurement.Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
With the recent modifications done to untie the session and
symbol layers, 'perf probe' now can use just the symbols layer.Signed-off-by: Arnaldo Carvalho de Melo
Acked-by: Masami Hiramatsu
Cc: Frédéric Weisbecker
Cc: Masami Hiramatsu
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
Signed-off-by: Ingo Molnar -
We can check using strcmp, most DSOs don't start with '[' so the
test is cheap enough and we had to test it there anyway since
when reading perf.data files we weren't calling the routine that
created this global variable and thus weren't setting it as
"loaded", which was causing a bogus:Failed to open [vdso], continuing without symbols
Message as the first line of 'perf report'.
Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
While debugging a problem reported by Pekka Enberg by printing
the IP and all the maps for a thread when we don't find a map
for an IP I noticed that dso__load_sym needs to fixup these
extra maps it creates to hold symbols in different ELF sections
than the main kernel one.Now we're back showing things like:
[root@doppio linux-2.6-tip]# perf report | grep vsyscall
0.02% mutt [kernel.kallsyms].vsyscall_fn [.] vread_hpet
0.01% named [kernel.kallsyms].vsyscall_fn [.] vread_hpet
0.01% NetworkManager [kernel.kallsyms].vsyscall_fn [.] vread_hpet
0.01% gconfd-2 [kernel.kallsyms].vsyscall_0 [.] vgettimeofday
0.01% hald-addon-rfki [kernel.kallsyms].vsyscall_fn [.] vread_hpet
0.00% dbus-daemon [kernel.kallsyms].vsyscall_fn [.] vread_hpet
[root@doppio linux-2.6-tip]#Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Pekka Enberg
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar -
I noticed while writing the first test in 'perf regtest' that to
just test the symbol handling routines one needs to create a
perf session, that is a layer centered on a perf.data file,
events, etc, so I untied these layers.This reduces the complexity for the users as the number of
parameters to most of the symbols and session APIs now was
reduced while not adding more state to all the map instances by
only having data that is needed to split the kernel (kallsyms
and ELF symtab sections) maps and do vmlinux relocation on the
main kernel map.Signed-off-by: Arnaldo Carvalho de Melo
Cc: Frédéric Weisbecker
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Paul Mackerras
LKML-Reference:
Signed-off-by: Ingo Molnar
03 Feb, 2010
1 commit
-
Open perf data file with O_LARGEFILE flag since its size is
easily larger that 2G.For example:
# rm -rf perf.data
# ./perf kmem record sleep 300[ perf record: Woken up 0 times to write data ]
[ perf record: Captured and wrote 3142.147 MB perf.data
(~137282513 samples) ]# ll -h perf.data
-rw------- 1 root root 3.1G .....Signed-off-by: Xiao Guangrong
Cc: Frederic Weisbecker
Cc: Steven Rostedt
Cc: Paul Mackerras
Cc: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar
31 Jan, 2010
2 commits
-
Fix up a few small stylistic details:
- use consistent vertical spacing/alignment
- remove line80 artifacts
- group some global variables better
- remove dead codePlus rename 'prof' to 'report' to make it more in line with other
tools, and remove the line/file keying as we really want to use
IPs like the other tools do.Signed-off-by: Ingo Molnar
Cc: Hitoshi Mitake
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar -
Adding new subcommand "perf lock" to perf.
I have a lot of remaining ToDos, but for now perf lock can
already provide minimal functionality for analyzing lock
statistics.Signed-off-by: Hitoshi Mitake
Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Frederic Weisbecker
LKML-Reference:
Signed-off-by: Ingo Molnar
