From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Andi Kleen <ak@linux.intel.com>, Wang Nan <wangnan0@huawei.com>
Subject: [PATCH 08/25] perf map: No need to adjust the long name of modules
Date: Tue, 19 Nov 2019 08:32:28 -0300 [thread overview]
Message-ID: <20191119113245.19593-9-acme@kernel.org> (raw)
In-Reply-To: <20191119113245.19593-1-acme@kernel.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
At some point in the past we needed to make sure we would get the long
name of modules and not just what we get from /proc/modules, but that
need, as described in the cset that introduced the adjustment function:
Fixes: c03d5184f0e9 ("perf machine: Adjust dso->long_name for offline module")
Without using the buildid-cache:
# lsmod | grep trusted
# insmod trusted.ko
# lsmod | grep trusted
trusted 24576 0
# strace -e open,openat perf probe -m ./trusted.ko key_seal |& grep trusted
openat(AT_FDCWD, "/sys/module/trusted/notes/.note.gnu.build-id", O_RDONLY) = 4
openat(AT_FDCWD, "/sys/module/trusted/notes/.note.gnu.build-id", O_RDONLY) = 7
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/.debug/root/trusted.ko/dd3d355d567394d540f527e093e0f64b95879584/probes", O_RDWR|O_CREAT, 0644) = 3
openat(AT_FDCWD, "/usr/lib/debug/root/trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/root/trusted.ko", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/.debug/trusted.ko", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, ".debug/trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 4
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
probe:key_seal (on key_seal in trusted)
# perf probe -l
probe:key_seal (on key_seal in trusted)
#
No attempt at opening '[trusted]'.
Now using the build-id cache:
# rmmod trusted
# perf buildid-cache --add ./trusted.ko
# insmod trusted.ko
# strace -e open,openat perf probe -m ./trusted.ko key_seal |& grep trusted
openat(AT_FDCWD, "/sys/module/trusted/notes/.note.gnu.build-id", O_RDONLY) = 4
openat(AT_FDCWD, "/sys/module/trusted/notes/.note.gnu.build-id", O_RDONLY) = 7
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/.debug/root/trusted.ko/dd3d355d567394d540f527e093e0f64b95879584/probes", O_RDWR|O_CREAT, 0644) = 3
openat(AT_FDCWD, "/usr/lib/debug/root/trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/root/trusted.ko", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/.debug/trusted.ko", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, ".debug/trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "trusted.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 4
openat(AT_FDCWD, "/root/trusted.ko", O_RDONLY) = 3
#
Again, no attempt at reading '[trusted]'.
Finally, adding a probe to that function and then using:
[root@quaco ~]# perf trace -e probe_perf:*/max-stack=16/ --max-events=2
0.000 perf/13456 probe_perf:dso__adjust_kmod_long_name(__probe_ip: 5492263)
dso__adjust_kmod_long_name (/home/acme/bin/perf)
machine__process_kernel_mmap_event (/home/acme/bin/perf)
machine__process_mmap_event (/home/acme/bin/perf)
perf_event__process_mmap (/home/acme/bin/perf)
machines__deliver_event (/home/acme/bin/perf)
perf_session__deliver_event (/home/acme/bin/perf)
perf_session__process_event (/home/acme/bin/perf)
process_simple (/home/acme/bin/perf)
reader__process_events (/home/acme/bin/perf)
__perf_session__process_events (/home/acme/bin/perf)
perf_session__process_events (/home/acme/bin/perf)
process_buildids (/home/acme/bin/perf)
record__finish_output (/home/acme/bin/perf)
__cmd_record (/home/acme/bin/perf)
cmd_record (/home/acme/bin/perf)
run_builtin (/home/acme/bin/perf)
0.055 perf/13456 probe_perf:dso__adjust_kmod_long_name(__probe_ip: 5492263)
dso__adjust_kmod_long_name (/home/acme/bin/perf)
machine__process_kernel_mmap_event (/home/acme/bin/perf)
machine__process_mmap_event (/home/acme/bin/perf)
perf_event__process_mmap (/home/acme/bin/perf)
machines__deliver_event (/home/acme/bin/perf)
perf_session__deliver_event (/home/acme/bin/perf)
perf_session__process_event (/home/acme/bin/perf)
process_simple (/home/acme/bin/perf)
reader__process_events (/home/acme/bin/perf)
__perf_session__process_events (/home/acme/bin/perf)
perf_session__process_events (/home/acme/bin/perf)
process_buildids (/home/acme/bin/perf)
record__finish_output (/home/acme/bin/perf)
__cmd_record (/home/acme/bin/perf)
cmd_record (/home/acme/bin/perf)
run_builtin (/home/acme/bin/perf)
#
This was the only path I could find using the perf tools that reach at this
function, then as of november/2019, if we put a probe in the line where the
actuall setting of the dso->long_name is done:
# perf trace -e probe_perf:*
^C[root@quaco ~]
# perf stat -e probe_perf:* -I 2000
2.000404265 0 probe_perf:dso__adjust_kmod_long_name
4.001142200 0 probe_perf:dso__adjust_kmod_long_name
6.001704120 0 probe_perf:dso__adjust_kmod_long_name
8.002398316 0 probe_perf:dso__adjust_kmod_long_name
10.002984010 0 probe_perf:dso__adjust_kmod_long_name
12.003597851 0 probe_perf:dso__adjust_kmod_long_name
14.004113303 0 probe_perf:dso__adjust_kmod_long_name
16.004582773 0 probe_perf:dso__adjust_kmod_long_name
18.005176373 0 probe_perf:dso__adjust_kmod_long_name
20.005801605 0 probe_perf:dso__adjust_kmod_long_name
22.006467540 0 probe_perf:dso__adjust_kmod_long_name
^C 23.683261941 0 probe_perf:dso__adjust_kmod_long_name
#
Its not being used at all.
To further test this I used kvm.ko as the offline module, i.e. removed
if from the buildid-cache by nuking it completely (rm -rf ~/.debug) and
moved it from the normal kernel distro path, removed the modules, stoped
the kvm guest, and then installed it manually, etc.
# rmmod kvm-intel
# rmmod kvm
# lsmod | grep kvm
# modprobe kvm-intel
modprobe: ERROR: ctx=0x55d3b1722260 path=/lib/modules/5.3.8-200.fc30.x86_64/kernel/arch/x86/kvm/kvm.ko.xz error=No such file or directory
modprobe: ERROR: ctx=0x55d3b1722260 path=/lib/modules/5.3.8-200.fc30.x86_64/kernel/arch/x86/kvm/kvm.ko.xz error=No such file or directory
modprobe: ERROR: could not insert 'kvm_intel': Unknown symbol in module, or unknown parameter (see dmesg)
# insmod ./kvm.ko
# modprobe kvm-intel
modprobe: ERROR: ctx=0x562f34026260 path=/lib/modules/5.3.8-200.fc30.x86_64/kernel/arch/x86/kvm/kvm.ko.xz error=No such file or directory
modprobe: ERROR: ctx=0x562f34026260 path=/lib/modules/5.3.8-200.fc30.x86_64/kernel/arch/x86/kvm/kvm.ko.xz error=No such file or directory
# lsmod | grep kvm
kvm_intel 299008 0
kvm 765952 1 kvm_intel
irqbypass 16384 1 kvm
#
# perf probe -x ~/bin/perf machine__findnew_module_map:12 mname=m.name:string filename=filename:string 'dso_long_name=map->dso->long_name:string' 'dso_name=map->dso->name:string'
# perf probe -l
probe_perf:machine__findnew_module_map (on machine__findnew_module_map:12@util/machine.c in /home/acme/bin/perf with mname filename dso_long_name dso_name)
# perf record
^C[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 3.416 MB perf.data (33956 samples) ]
# perf trace -e probe_perf:machine*
<SNIP>
6.322 perf/23099 probe_perf:machine__findnew_module_map(__probe_ip: 5492493, mname: "[salsa20_generic]", filename: "/lib/modules/5.3.8-200.fc30.x86_64/kernel/crypto/salsa20_generic.ko.xz", dso_long_name: "/lib/modules/5.3.8-200.fc30.x86_64/kernel/crypto/salsa20_generic.ko.xz", dso_name: "[salsa20_generic]")
6.375 perf/23099 probe_perf:machine__findnew_module_map(__probe_ip: 5492493, mname: "[kvm]", filename: "[kvm]", dso_long_name: "[kvm]", dso_name: "[kvm]")
<SNIP>
The filename doesn't come with the path, no point in trying to set the dso->long_name.
[root@quaco ~]# strace -e open,openat perf probe -m ./kvm.ko kvm_apic_local_deliver |& egrep 'open.*kvm'
openat(AT_FDCWD, "/sys/module/kvm_intel/notes/.note.gnu.build-id", O_RDONLY) = 4
openat(AT_FDCWD, "/sys/module/kvm/notes/.note.gnu.build-id", O_RDONLY) = 4
openat(AT_FDCWD, "/lib/modules/5.3.8-200.fc30.x86_64/kernel/arch/x86/kvm", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 7
openat(AT_FDCWD, "/sys/module/kvm_intel/notes/.note.gnu.build-id", O_RDONLY) = 8
openat(AT_FDCWD, "/root/kvm.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/.debug/root/kvm.ko/5955f426cb93f03f30f3e876814be2db80ab0b55/probes", O_RDWR|O_CREAT, 0644) = 3
openat(AT_FDCWD, "/usr/lib/debug/root/kvm.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/root/kvm.ko", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/.debug/kvm.ko", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/kvm.ko", O_RDONLY) = 3
openat(AT_FDCWD, "kvm.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, ".debug/kvm.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "kvm.ko.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/kvm.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/kvm.ko", O_RDONLY) = 3
openat(AT_FDCWD, "/root/kvm.ko", O_RDONLY) = 4
openat(AT_FDCWD, "/root/kvm.ko", O_RDONLY) = 3
[root@quaco ~]#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-jlfew3lyb24d58egrp0o72o2@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/machine.c | 27 +--------------------------
1 file changed, 1 insertion(+), 26 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 6a0f5c25ce3e..6804c8247782 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -772,24 +772,6 @@ int machine__process_ksymbol(struct machine *machine __maybe_unused,
return machine__process_ksymbol_register(machine, event, sample);
}
-static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
-{
- const char *dup_filename;
-
- if (!filename || !dso || !dso->long_name)
- return;
- if (dso->long_name[0] != '[')
- return;
- if (!strchr(filename, '/'))
- return;
-
- dup_filename = strdup(filename);
- if (!dup_filename)
- return;
-
- dso__set_long_name(dso, dup_filename, true);
-}
-
struct map *machine__findnew_module_map(struct machine *machine, u64 start,
const char *filename)
{
@@ -801,15 +783,8 @@ struct map *machine__findnew_module_map(struct machine *machine, u64 start,
return NULL;
map = map_groups__find_by_name(&machine->kmaps, m.name);
- if (map) {
- /*
- * If the map's dso is an offline module, give dso__load()
- * a chance to find the file path of that module by fixing
- * long_name.
- */
- dso__adjust_kmod_long_name(map->dso, filename);
+ if (map)
goto out;
- }
dso = machine__findnew_module_dso(machine, &m, filename);
if (dso == NULL)
--
2.21.0
next prev parent reply other threads:[~2019-11-19 11:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-19 11:32 [GIT PULL] perf/core improvements and fixes Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 01/25] perf vendor events arm64: Fix commas so PMU event files are valid JSON Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 02/25] perf vendor events power8: " Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 03/25] perf vendor events power9: " Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 04/25] perf scripts python: exported-sql-viewer.py: Fix use of TRUE with SQLite Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 05/25] perf maps: Purge the entries from maps->names in __maps__purge() Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 06/25] perf maps: Do not use an rbtree to sort by map name Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 07/25] perf map_groups: Add a front end cache for map lookups by name Arnaldo Carvalho de Melo
2019-11-19 11:32 ` Arnaldo Carvalho de Melo [this message]
2019-11-19 11:32 ` [PATCH 09/25] perf record: No need to process the synthesized MMAP events twice Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 10/25] perf machine: No need to check if kernel module maps pre-exist Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 11/25] perf map_groups: Auto sort maps by name, if needed Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 12/25] perf callchain: Fix segfault in thread__resolve_callchain_sample() Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 13/25] libtraceevent: Fix parsing of event %o and %X argument types Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 14/25] perf map: Use bitmap for booleans Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 15/25] perf map: Move seldom used ->flags field to second cacheline Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 16/25] x86/insn: perf tools: Add some instructions to the new instructions test Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 17/25] x86/insn: Add some Intel instructions to the opcode map Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 18/25] perf probe: Show correct statement line number by perf probe -l Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 19/25] perf probe: Verify given line is a representive line Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 20/25] perf probe: Do not show non representive lines by perf-probe -L Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 21/25] perf probe: Generate event name with line number Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 22/25] perf probe: Support multiprobe event Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 23/25] perf probe: Support DW_AT_const_value constant value Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 24/25] perf probe: Trace a magic number if variable is not found Arnaldo Carvalho de Melo
2019-11-19 11:32 ` [PATCH 25/25] perf parse: Report initial event parsing error Arnaldo Carvalho de Melo
2019-11-19 12:00 ` [GIT PULL] perf/core improvements and fixes Ingo Molnar
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