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ffd3d18c20
'perf record' and 'perf report --dump-raw-trace' supported in this
release.
Example usage:
# perf record -e arm_spe/ts_enable=1,pa_enable=1/ dd if=/dev/zero of=/dev/null count=10000
# perf report --dump-raw-trace
Note that the perf.data file is portable, so the report can be run on
another architecture host if necessary.
Output will contain raw SPE data and its textual representation, such
as:
0x5c8 [0x30]: PERF_RECORD_AUXTRACE size: 0x200000 offset: 0 ref: 0x1891ad0e idx: 1 tid: 2227 cpu: 1
.
. ... ARM SPE data: size 2097152 bytes
. 00000000: 49 00 LD
. 00000002: b2 c0 3b 29 0f 00 00 ff ff VA 0xffff00000f293bc0
. 0000000b: b3 c0 eb 24 fb 00 00 00 80 PA 0xfb24ebc0 ns=1
. 00000014: 9a 00 00 LAT 0 XLAT
. 00000017: 42 16 EV RETIRED L1D-ACCESS TLB-ACCESS
. 00000019: b0 00 c4 15 08 00 00 ff ff PC 0xff00000815c400 el3 ns=1
. 00000022: 98 00 00 LAT 0 TOT
. 00000025: 71 36 6c 21 2c 09 00 00 00 TS 39395093558
. 0000002e: 49 00 LD
. 00000030: b2 80 3c 29 0f 00 00 ff ff VA 0xffff00000f293c80
. 00000039: b3 80 ec 24 fb 00 00 00 80 PA 0xfb24ec80 ns=1
. 00000042: 9a 00 00 LAT 0 XLAT
. 00000045: 42 16 EV RETIRED L1D-ACCESS TLB-ACCESS
. 00000047: b0 f4 11 16 08 00 00 ff ff PC 0xff0000081611f4 el3 ns=1
. 00000050: 98 00 00 LAT 0 TOT
. 00000053: 71 36 6c 21 2c 09 00 00 00 TS 39395093558
. 0000005c: 48 00 INSN-OTHER
. 0000005e: 42 02 EV RETIRED
. 00000060: b0 2c ef 7f 08 00 00 ff ff PC 0xff0000087fef2c el3 ns=1
. 00000069: 98 00 00 LAT 0 TOT
. 0000006c: 71 d1 6f 21 2c 09 00 00 00 TS 39395094481
...
Other release notes:
- applies to acme's perf/{core,urgent} branches, likely elsewhere
- Report is self-contained within the tool.
Record requires enabling the kernel SPE driver by
setting CONFIG_ARM_SPE_PMU.
- The intel-bts implementation was used as a starting point; its
min/default/max buffer sizes and power of 2 pages granularity need to be
revisited for ARM SPE
- Recording across multiple SPE clusters/domains not supported
- Snapshot support (record -S), and conversion to native perf events
(e.g., via 'perf inject --itrace'), are also not supported
- Technically both cs-etm and spe can be used simultaneously, however
disabled for simplicity in this release
Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Reviewed-by: Dongjiu Geng <gengdongjiu@huawei.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/20180114132850.0b127434b704a26bad13268f@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.