linux-kernel - [PATCH v3 0/2] perf probe: add sdt probes arguments into the uprobe cmd string

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Date:   Fri, 25 Nov 2016 00:13:38 +0100
From:   Alexis Berlemont <alexis.berlemont@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alexis Berlemont <alexis.berlemont@...il.com>,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, hemant@...ux.vnet.ibm.com
Subject: [PATCH v3 0/2] perf probe: add sdt probes arguments into the uprobe cmd string

Hi Hemant,

Once more thank you for your answer.

Sorry for this bug: I tested the patches only on small sample
binaries. Now it is tested against the systemtap-enabled libraries
libc and libpthread. There were 2 problems:

* The one you disclosed: in indirect addressing mode, positive offsets
  not prefixed with a '+' character;
* Another one still in indirect addressing mode: offsets which were
  not constants but symbols;

The following patches solves them both.

# cat /sys/kernel/tracing/uprobe_events
p:sdt_libpthread/pthread_start /lib/libpthread-2.23.so:0x0000000000007448 arg0=%ax:u64 arg1=+1600(%ax):u64 arg2=+1608(%ax):u64
p:sdt_libpthread/pthread_create /lib/libpthread-2.23.so:0x0000000000007be9 arg0=%ax:u64 arg1=-184(%bp):u64 arg2=-160(%bp):u64 arg3=-168(%bp):u64
p:sdt_libpthread/pthread_join /lib/libpthread-2.23.so:0x000000000000864d arg0=%di:u64
p:sdt_libpthread/pthread_join_ret /lib/libpthread-2.23.so:0x00000000000086fe arg0=%bx:u64 arg1=%ax:s32 arg2=+1584(%bx):u64
p:sdt_libpthread/mutex_init /lib/libpthread-2.23.so:0x000000000000938b arg0=%di:u64
p:sdt_libpthread/mutex_destroy /lib/libpthread-2.23.so:0x0000000000009410 arg0=%di:u64
p:sdt_libpthread/mutex_acquired /lib/libpthread-2.23.so:0x0000000000009685 arg0=%bx:u64
p:sdt_libpthread/mutex_acquired_1 /lib/libpthread-2.23.so:0x0000000000009b31 arg0=%r8:u64
...

# cat /sys/kernel/tracing/uprobe_events
p:sdt_libc/setjmp /lib/libc-2.23.so:0x0000000000033181 arg0=%di:u64 arg1=%si:s32 arg2=%ax:u64
p:sdt_libc/longjmp /lib/libc-2.23.so:0x0000000000033263 arg0=%di:u64 arg1=%si:s32 arg2=%dx:u64
p:sdt_libc/longjmp_1 /lib/libc-2.23.so:0x00000000000f7fc3 arg0=%di:u64 arg1=%si:s32 arg2=%dx:u64
p:sdt_libc/longjmp_target /lib/libc-2.23.so:0x000000000003327f arg0=%di:u64 arg1=%ax:s32 arg2=%dx:u64
p:sdt_libc/longjmp_target_1 /lib/libc-2.23.so:0x00000000000f7fdf arg0=%di:u64 arg1=%ax:s32 arg2=%dx:u64
...

Thanks,

Alexis.


Alexis Berlemont (2):
  perf sdt: add scanning of sdt probles arguments
  perf probe: add sdt probes arguments into the uprobe cmd string

 tools/perf/arch/x86/util/perf_regs.c |  18 ++++
 tools/perf/util/perf_regs.c          |   4 +
 tools/perf/util/perf_regs.h          |  13 +++
 tools/perf/util/probe-file.c         | 169 ++++++++++++++++++++++++++++++++++-
 tools/perf/util/symbol-elf.c         |  16 +++-
 tools/perf/util/symbol.h             |   1 +
 6 files changed, 216 insertions(+), 5 deletions(-)

-- 
2.10.2