linux-kernel - [PATCH 0/3] Add support for perf user stack dump in powerpc

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Date:	Thu, 28 Apr 2016 15:01:07 +0530
From:	Chandan Kumar <chandan.kumar@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:	acme@...hat.com, mpe@...erman.id.au, jolsa@...hat.com,
	anju@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com,
	naveen.n.rao@...ux.vnet.ibm.com, hemant@...ux.vnet.ibm.com,
	Chandan Kumar <chandan.kumar@...ux.vnet.ibm.com>
Subject: [PATCH 0/3] Add support for perf user stack dump in powerpc

This patch set enables perf user stack dump on powerpc

Example with "ls" command as user program
./perf record --call-graph=dwarf,8192 ls

./perf script
---------8< -----
..
...
perf 12549 75938.934539:       1771 cycles:ppp: 
                  210d90 .perf_event_exec (/boot/vmlinux)
                  34b914 .load_elf_binary (/boot/vmlinux)
                  2dcabc .search_binary_handler (/boot/vmlinux)
                  2dd6f0 .do_execveat_common.isra.28 (/boot/vmlinux)
                  2ddcd8 .sys_execve (/boot/vmlinux)
                   19258 system_call (/boot/vmlinux)

perf 12549 75938.934549:       8415 cycles:ppp: 
                  207a88 .perf_event_aux_ctx (/boot/vmlinux)
                       0 [unknown] ([unknown])
                  214ab8 .perf_event_comm (/boot/vmlinux)
                  2dcfb8 .__set_task_comm (/boot/vmlinux)
                  2ddb44 .setup_new_exec (/boot/vmlinux)
                  34b914 .load_elf_binary (/boot/vmlinux)
                  2dcabc .search_binary_handler (/boot/vmlinux)
                  2dd6f0 .do_execveat_common.isra.28 (/boot/vmlinux)
                  2ddcd8 .sys_execve (/boot/vmlinux)
                   19258 system_call (/boot/vmlinux)

ls 12549 75938.934562:      33745 cycles:ppp: 
                   ee570 .task_work_add (/boot/vmlinux)
                       0 [unknown] ([unknown])
                  2ce380 .filp_close (/boot/vmlinux)
                  2fc464 .do_close_on_exec (/boot/vmlinux)
                  2ddbd8 .setup_new_exec (/boot/vmlinux)
                  34b914 .load_elf_binary (/boot/vmlinux)
                  2dcabc .search_binary_handler (/boot/vmlinux)
                  2dd6f0 .do_execveat_common.isra.28 (/boot/vmlinux)
                  2ddcd8 .sys_execve (/boot/vmlinux)
                   19258 system_call (/boot/vmlinux)

ls 12549 75938.934587:     116078 cycles:ppp: 
                   6ff94 .__clear_user (/boot/vmlinux)
                  944400 .padzero ([kernel.vmlinux].text.unlikely)
                  34bd28 .load_elf_binary (/boot/vmlinux)
                  2dcabc .search_binary_handler (/boot/vmlinux)
                  2dd6f0 .do_execveat_common.isra.28 (/boot/vmlinux)
                  2ddcd8 .sys_execve (/boot/vmlinux)
                   19258 system_call (/boot/vmlinux)
...
..
----- 8< -----

Chandan Kumar (2):
  powerpc: Add HAVE_PERF_USER_STACK_DUMP support
  powerpc/perf: Add support for unwinding perf-stackdump

Naveen N. Rao (1):
  perf tools: Fix perf regs mask generation

 .../features/perf/perf-regs/arch-support.txt       |  2 +-
 .../features/perf/perf-stackdump/arch-support.txt  |  2 +-
 arch/powerpc/Kconfig                               |  1 +
 tools/perf/arch/powerpc/util/Build                 |  1 +
 tools/perf/arch/powerpc/util/unwind-libunwind.c    | 96 ++++++++++++++++++++++
 tools/perf/config/Makefile                         |  1 +
 tools/perf/util/perf_regs.c                        |  8 +-
 7 files changed, 105 insertions(+), 6 deletions(-)
 create mode 100644 tools/perf/arch/powerpc/util/unwind-libunwind.c

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