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author | William Cohen <wcohen@redhat.com> | 2017-12-04 09:57:28 -0500 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-12-05 15:43:55 -0300 |
commit | fbc2844e84038ce3687d203ac80b66194e9f21e6 (patch) | |
tree | c249dd72fd51f175574177adce7ddafc4e7b824e /tools/perf/pmu-events | |
parent | 0125195268a0f9886b582c7e73da98f89029796f (diff) | |
download | op-kernel-dev-fbc2844e84038ce3687d203ac80b66194e9f21e6.zip op-kernel-dev-fbc2844e84038ce3687d203ac80b66194e9f21e6.tar.gz |
perf vendor events: Use more flexible pattern matching for CPU identification for mapfile.csv
The powerpc cpuid information includes chip revision information.
Changes between chip revisions are usually minor bug fixes and usually
do not affect the operation of the performance monitoring hardware.
The original mapfile.csv matching requires enumerating every possible
cpuid string. When a new minor chip revision is produced a new entry
has to be added to the mapfile.csv and the code recompiled to allow perf
to have the implementation specific perf events for this new minor
revision. For users of various distibutions of Linux having to wait for
a new release of the kernel's perf tool to be built with these trivial
patches is inconvenient.
Using regular expressions rather than exactly string matching of the
entire cpuid string allows developers to write mapfile.csv files that do
not require patches and recompiles for each of these minor version
changes. If special cases need to be made for some particular versions,
they can be placed earlier in the mapfile.csv file before the more
general matches.
Signed-off-by: William Cohen <wcohen@redhat.com>
Tested-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shriya <shriyak@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20171204145728.16792-1-wcohen@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/pmu-events')
-rw-r--r-- | tools/perf/pmu-events/arch/powerpc/mapfile.csv | 12 | ||||
-rw-r--r-- | tools/perf/pmu-events/arch/x86/mapfile.csv | 5 | ||||
-rw-r--r-- | tools/perf/pmu-events/jevents.c | 39 |
3 files changed, 41 insertions, 15 deletions
diff --git a/tools/perf/pmu-events/arch/powerpc/mapfile.csv b/tools/perf/pmu-events/arch/powerpc/mapfile.csv index a0f3a11..229150e 100644 --- a/tools/perf/pmu-events/arch/powerpc/mapfile.csv +++ b/tools/perf/pmu-events/arch/powerpc/mapfile.csv @@ -13,13 +13,5 @@ # # Power8 entries -004b0000,1,power8,core -004b0201,1,power8,core -004c0000,1,power8,core -004d0000,1,power8,core -004d0100,1,power8,core -004d0200,1,power8,core -004c0100,1,power8,core -004e0100,1,power9,core -004e0200,1,power9,core -004e1200,1,power9,core +004[bcd][[:xdigit:]]{4},1,power8,core +004e[[:xdigit:]]{4},1,power9,core diff --git a/tools/perf/pmu-events/arch/x86/mapfile.csv b/tools/perf/pmu-events/arch/x86/mapfile.csv index fe1a2c4..93656f2 100644 --- a/tools/perf/pmu-events/arch/x86/mapfile.csv +++ b/tools/perf/pmu-events/arch/x86/mapfile.csv @@ -23,10 +23,7 @@ GenuineIntel-6-1E,v2,nehalemep,core GenuineIntel-6-1F,v2,nehalemep,core GenuineIntel-6-1A,v2,nehalemep,core GenuineIntel-6-2E,v2,nehalemex,core -GenuineIntel-6-4E,v24,skylake,core -GenuineIntel-6-5E,v24,skylake,core -GenuineIntel-6-8E,v24,skylake,core -GenuineIntel-6-9E,v24,skylake,core +GenuineIntel-6-[4589]E,v24,skylake,core GenuineIntel-6-37,v13,silvermont,core GenuineIntel-6-4D,v13,silvermont,core GenuineIntel-6-4C,v13,silvermont,core diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c index 9eb7047..b578aa2 100644 --- a/tools/perf/pmu-events/jevents.c +++ b/tools/perf/pmu-events/jevents.c @@ -116,6 +116,43 @@ static void fixdesc(char *s) *e = 0; } +/* Add escapes for '\' so they are proper C strings. */ +static char *fixregex(char *s) +{ + int len = 0; + int esc_count = 0; + char *fixed = NULL; + char *p, *q; + + /* Count the number of '\' in string */ + for (p = s; *p; p++) { + ++len; + if (*p == '\\') + ++esc_count; + } + + if (esc_count == 0) + return s; + + /* allocate space for a new string */ + fixed = (char *) malloc(len + 1); + if (!fixed) + return NULL; + + /* copy over the characters */ + q = fixed; + for (p = s; *p; p++) { + if (*p == '\\') { + *q = '\\'; + ++q; + } + *q = *p; + ++q; + } + *q = '\0'; + return fixed; +} + static struct msrmap { const char *num; const char *pname; @@ -648,7 +685,7 @@ static int process_mapfile(FILE *outfp, char *fpath) } line[strlen(line)-1] = '\0'; - cpuid = strtok_r(p, ",", &save); + cpuid = fixregex(strtok_r(p, ",", &save)); version = strtok_r(NULL, ",", &save); fname = strtok_r(NULL, ",", &save); type = strtok_r(NULL, ",", &save); |