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Message-ID: <YdRYk8Ic8qdEAhQz@krava>
Date: Tue, 4 Jan 2022 15:24:19 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Ian Rogers <irogers@...gle.com>
Cc: Andi Kleen <ak@...ux.intel.com>,
Namhyung Kim <namhyung@...nel.org>,
John Garry <john.garry@...wei.com>,
Kajol Jain <kjain@...ux.ibm.com>,
"Paul A . Clarke" <pc@...ibm.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Riccardo Mancini <rickyman7@...il.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
Vineet Singh <vineet.singh@...el.com>,
James Clark <james.clark@....com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>,
Leo Yan <leo.yan@...aro.org>, coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org, zhengjun.xing@...el.com,
eranian@...gle.com
Subject: Re: [PATCH v3 00/48] Refactor perf cpumap
On Wed, Dec 29, 2021 at 11:19:41PM -0800, Ian Rogers wrote:
> Perf cpu map has various functions where a cpumap and index are passed
> in order to load the cpu. A problem with this is that the wrong index
> may be passed for the cpumap, causing problems like aggregation on the
> wrong CPU:
> https://lore.kernel.org/lkml/20211204023409.969668-1-irogers@google.com/
>
> This patch set refactors the cpu map API, reducing it and explicitly
> passing the cpu (rather than the pair) to functions that need
> it. Comments are added at the same time. Changes modify the same
> file/function more than once as refactoring and fixes are broken apart
> for the sake of bisection.
>
> v2. Incorproates fixes suggested Jiri Olsa, rewrites the evlist CPU
> iterator in part in a way suggested by Riccardo Mancini. The new
> fixes start at patch 23. The final change was suggested by John
> Garry to make the CPUs have their own struct wrapper.
>
> v3. Incorporates fixes suggested by Namhyung Kim.
>
> Ian Rogers (48):
you doubled the amount of patches from v1? ;-)
I had small comments for the first 22 patches and would be ok
with them merged.. will try to go through the rest soon
thanks,
jirka
> libperf: Add comments to perf_cpu_map.
> perf stat: Add aggr creators that are passed a cpu.
> perf stat: Correct aggregation CPU map
> perf stat: Switch aggregation to use for_each loop
> perf stat: Switch to cpu version of cpu_map__get
> perf cpumap: Switch cpu_map__build_map to cpu function
> perf cpumap: Remove map+index get_socket
> perf cpumap: Remove map+index get_die
> perf cpumap: Remove map+index get_core
> perf cpumap: Remove map+index get_node
> perf cpumap: Add comments to aggr_cpu_id
> perf cpumap: Remove unused cpu_map__socket
> perf cpumap: Simplify equal function name.
> perf cpumap: Rename empty functions.
> perf cpumap: Document cpu__get_node and remove redundant function
> perf cpumap: Remove map from function names that don't use a map.
> perf cpumap: Remove cpu_map__cpu, use libperf function.
> perf cpumap: Refactor cpu_map__build_map
> perf cpumap: Rename cpu_map__get_X_aggr_by_cpu functions
> perf cpumap: Move 'has' function to libperf
> perf cpumap: Add some comments to cpu_aggr_map
> perf cpumap: Trim the cpu_aggr_map
> perf stat: Fix memory leak in check_per_pkg
> perf cpumap: Add CPU to aggr_cpu_id
> perf stat-display: Avoid use of core for CPU.
> perf evsel: Derive CPUs and threads in alloc_counts
> libperf: Switch cpu to more accurate cpu_map_idx
> libperf: Use cpu not index for evsel mmap
> perf counts: Switch name cpu to cpu_map_idx
> perf stat: Rename aggr_data cpu to imply it's an index
> perf stat: Use perf_cpu_map__for_each_cpu
> perf script: Use for each cpu to aid readability
> libperf: Allow NULL in perf_cpu_map__idx
> perf evlist: Refactor evlist__for_each_cpu.
> perf evsel: Pass cpu not cpu map index to synthesize
> perf stat: Correct variable name for read counter
> perf evsel: Rename CPU around get_group_fd
> perf evsel: Reduce scope of evsel__ignore_missing_thread
> perf evsel: Rename variable cpu to index
> perf test: Use perf_cpu_map__for_each_cpu
> perf stat: Correct check_per_pkg cpu
> perf stat: Swap variable name cpu to index
> libperf: Sync evsel documentation
> perf bpf: Rename cpu to cpu_map_idx
> perf c2c: Use more intention revealing iterator
> perf script: Fix flipped index and cpu
> perf stat: Correct first_shadow_cpu to return index
> perf cpumap: Give CPUs their own type.
>
> tools/lib/perf/Documentation/libperf.txt | 11 +-
> tools/lib/perf/cpumap.c | 131 +++--
> tools/lib/perf/evlist.c | 4 +-
> tools/lib/perf/evsel.c | 92 ++--
> tools/lib/perf/include/internal/cpumap.h | 18 +-
> tools/lib/perf/include/internal/evlist.h | 3 +-
> tools/lib/perf/include/internal/evsel.h | 4 +-
> tools/lib/perf/include/internal/mmap.h | 5 +-
> tools/lib/perf/include/perf/cpumap.h | 8 +-
> tools/lib/perf/include/perf/evsel.h | 10 +-
> tools/lib/perf/libperf.map | 1 +
> tools/lib/perf/mmap.c | 2 +-
> tools/perf/arch/arm/util/cs-etm.c | 16 +-
> tools/perf/bench/epoll-ctl.c | 2 +-
> tools/perf/bench/epoll-wait.c | 2 +-
> tools/perf/bench/futex-hash.c | 2 +-
> tools/perf/bench/futex-lock-pi.c | 2 +-
> tools/perf/bench/futex-requeue.c | 2 +-
> tools/perf/bench/futex-wake-parallel.c | 2 +-
> tools/perf/bench/futex-wake.c | 2 +-
> tools/perf/builtin-c2c.c | 15 +-
> tools/perf/builtin-ftrace.c | 2 +-
> tools/perf/builtin-kmem.c | 2 +-
> tools/perf/builtin-record.c | 2 +-
> tools/perf/builtin-sched.c | 71 +--
> tools/perf/builtin-script.c | 10 +-
> tools/perf/builtin-stat.c | 516 +++++++++---------
> tools/perf/tests/attr.c | 6 +-
> tools/perf/tests/bitmap.c | 2 +-
> tools/perf/tests/cpumap.c | 6 +-
> tools/perf/tests/event_update.c | 6 +-
> tools/perf/tests/mem2node.c | 2 +-
> tools/perf/tests/mmap-basic.c | 4 +-
> tools/perf/tests/openat-syscall-all-cpus.c | 39 +-
> tools/perf/tests/stat.c | 3 +-
> tools/perf/tests/topology.c | 43 +-
> tools/perf/util/affinity.c | 2 +-
> tools/perf/util/auxtrace.c | 12 +-
> tools/perf/util/auxtrace.h | 5 +-
> tools/perf/util/bpf_counter.c | 16 +-
> tools/perf/util/bpf_counter.h | 4 +-
> tools/perf/util/counts.c | 8 +-
> tools/perf/util/counts.h | 14 +-
> tools/perf/util/cpumap.c | 253 ++++-----
> tools/perf/util/cpumap.h | 116 ++--
> tools/perf/util/cputopo.c | 6 +-
> tools/perf/util/env.c | 29 +-
> tools/perf/util/env.h | 3 +-
> tools/perf/util/evlist.c | 148 ++---
> tools/perf/util/evlist.h | 50 +-
> tools/perf/util/evsel.c | 143 ++---
> tools/perf/util/evsel.h | 27 +-
> tools/perf/util/expr.c | 2 +-
> tools/perf/util/header.c | 6 +-
> tools/perf/util/mmap.c | 19 +-
> tools/perf/util/mmap.h | 3 +-
> tools/perf/util/perf_api_probe.c | 15 +-
> tools/perf/util/python.c | 4 +-
> tools/perf/util/record.c | 11 +-
> .../scripting-engines/trace-event-python.c | 6 +-
> tools/perf/util/session.c | 10 +-
> tools/perf/util/stat-display.c | 138 ++---
> tools/perf/util/stat-shadow.c | 308 +++++------
> tools/perf/util/stat.c | 47 +-
> tools/perf/util/stat.h | 9 +-
> tools/perf/util/svghelper.c | 6 +-
> tools/perf/util/synthetic-events.c | 12 +-
> tools/perf/util/synthetic-events.h | 3 +-
> tools/perf/util/util.h | 5 +-
> 69 files changed, 1333 insertions(+), 1155 deletions(-)
>
> --
> 2.34.1.448.ga2b2bfdf31-goog
>
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