Messages in this thread | | | From | Yi Sun <> | Subject | [PATCH v4 0/2] x86: Add xsave/xrstor Latency Trace Events and Consuming Script | Date | Tue, 30 Aug 2022 10:28:06 +0800 |
| |
This series introduces trace events which can dump the latency of instructions xsave and xrstor for x86 platform to tell when XSAVE/XRSTOR are getting more or less expensive, and get out the RFBM and XINUSE to figure out the reason.
We did bunch of internal testing, compared several optional latency calculation approaches. We believe it can be a more optimized one.
Also, the series introduces a script to consume trace log, which leverage sqlite3 to show statistics data such as max, min, latency and 97% tail latency.
This series has gone through several versions of peer-reviewed internally. All patches have review tags. It's ready for review by the x86@kernel.org maintainers.
- Change from v3 to v4: - Rebase patch set to the latest tag v6.0-rc3, replacing ALTERNATIVE_2 with ALTERNATIVE_3
- Change from v2 to v3: - Move the script xsave-latency-trace.sh to folder tools/testing/fpu/ (Ingo Molnar)
- Change from v1 to v2: - Reword the comments. (Laight, David; Mehta, Sohil) - Rename all variable 'dtsc' to 'latency'. (Mehta, Sohil)
Yi Sun (2): x86/fpu: Measure the Latency of XSAVE and XRSTOR tools/testing/fpu: Add script to consume trace log of xsave latency
arch/x86/include/asm/trace/fpu.h | 35 ++++ arch/x86/kernel/fpu/xstate.h | 49 ++++- tools/testing/fpu/xsave-latency-trace.sh | 227 +++++++++++++++++++++++ 3 files changed, 306 insertions(+), 5 deletions(-) create mode 100755 tools/testing/fpu/xsave-latency-trace.sh
-- 2.34.1
| |