[{"id":3689993,"web_url":"http://patchwork.ozlabs.org/comment/3689993/","msgid":"<0FE86BD2-554C-402C-80A2-C8F86FC2F685@linux.ibm.com>","date":"2026-05-12T08:52:40","subject":"Re: [PATCH V4 1/2] tools/perf: Fix the check for parameterized field\n in event term","submitter":{"id":89673,"url":"http://patchwork.ozlabs.org/api/people/89673/","name":"Venkat","email":"venkat88@linux.ibm.com"},"content":"> On 4 May 2026, at 9:12 PM, Athira Rajeev wrote:\n> \n> The format_alias() function in util/pmu.c has a check to\n> detect whether the event has parameterized field ( =? ).\n> The string alias->terms contains the event and if the event\n> has user configurable parameter, there will be presence of\n> sub string \"=?\" in the alias->terms.\n> \n> Snippet of code:\n> \n> /* Paramemterized events have the parameters shown. */\n> if (strstr(alias->terms, \"=?\")) {\n> /* No parameters. */\n> snprintf(buf, len, \"%.*s/%s/\", (int)pmu_name_len, pmu->name, alias->name);\n> \n> if \"strstr\" contains the substring, it returns a pointer\n> and hence enters the above check which is not the expected\n> check. And hence \"perf list\" doesn't have the parameterized\n> fields in the result.\n> \n> Fix this check to use:\n> \n> if (!strstr(alias->terms, \"=?\")) {\n> \n> With this change, perf list shows the events correctly with\n> the strings showing parameters.\n> \n> Before the fix:\n> \n> # ./perf list|grep -w PM_PAU_CYC\n> hv_24x7/PM_PAU_CYC/ [Kernel PMU event]\n> \n> With this fix:\n> \n> # ./perf list|grep -w PM_PAU_CYC\n> hv_24x7/PM_PAU_CYC,chip=?/ [Kernel PMU event]\n> \n> Signed-off-by: Athira Rajeev \n\nTested-by: Venkat Rao Bagalkote \n> ---\n> Changelog:\n> v3 -> v4:\n> Updated commit message to show real example\n> addressing review comment from Namhyung.\n> \n> v2 -> v3:\n> Split the strstr correction in a single patch\n> \n> tools/perf/util/pmu.c | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n> \n> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c\n> index 23337d2fa281..0b8d58543f17 100644\n> --- a/tools/perf/util/pmu.c\n> +++ b/tools/perf/util/pmu.c\n> @@ -2117,7 +2117,7 @@ static char *format_alias(char *buf, int len, const struct perf_pmu *pmu,\n> skip_duplicate_pmus);\n> \n> /* Paramemterized events have the parameters shown. */\n> - if (strstr(alias->terms, \"=?\")) {\n> + if (!strstr(alias->terms, \"=?\")) {\n> /* No parameters. */\n> snprintf(buf, len, \"%.*s/%s/\", (int)pmu_name_len, pmu->name, alias->name);\n> return buf;\n> -- \n> 2.47.3\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=hJYvFx9Y;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n 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adrian.hunter@intel.com,\n mpetlan@redhat.com, tmricht@linux.ibm.com, maddy@linux.ibm.com,\n irogers@google.com, namhyung@kernel.org,\n linux-perf-users@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,\n hbathini@linux.vnet.ibm.com, Tejas.Manhas1@ibm.com,\n Tanushree.Shah@ibm.com, shivani@linux.ibm.com","Content-Transfer-Encoding":"quoted-printable","Message-Id":"<0FE86BD2-554C-402C-80A2-C8F86FC2F685@linux.ibm.com>","References":"<20260504154205.21394-1-atrajeev@linux.ibm.com>","To":"Athira Rajeev ","X-Mailer":"Apple Mail (2.3864.300.41.1.7)","X-TM-AS-GCONF":"00","X-Proofpoint-Reinject":"loops=2 maxloops=12","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNTEyMDA4NiBTYWx0ZWRfXxM/GFRstIpsX\n 1oPyVQIg85G1wuAmr7P7UaH/LxOSXyahbAWBkmVbi8D7O5Xenlyu+xuxWnItYX1NgXcUj3ll9+a\n NcpzhwKLCkHvjwuQeURYt1QLmNEXfBY06AhTA/Og0ilnNO2lUpQUZC7vPYm61vNudeMGsSN7vdF\n h0oQ7NgBdQI5fkh7sP59oFffeXjxWkT0BUhX/tL4PHkXVOIf/eMuGdbNnHAqiCS6GICeylyJfcP\n 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Rajeev wrote:\n> >\n> > The format_alias() function in util/pmu.c has a check to\n> > detect whether the event has parameterized field ( =? ).\n> > The string alias->terms contains the event and if the event\n> > has user configurable parameter, there will be presence of\n> > sub string \"=?\" in the alias->terms.\n> >\n> > Snippet of code:\n> >\n> > /* Paramemterized events have the parameters shown. */\n> > if (strstr(alias->terms, \"=?\")) {\n> > /* No parameters. */\n> > snprintf(buf, len, \"%.*s/%s/\", (int)pmu_name_len, pmu->name, alias->name);\n> >\n> > if \"strstr\" contains the substring, it returns a pointer\n> > and hence enters the above check which is not the expected\n> > check. And hence \"perf list\" doesn't have the parameterized\n> > fields in the result.\n> >\n> > Fix this check to use:\n> >\n> > if (!strstr(alias->terms, \"=?\")) {\n> >\n> > With this change, perf list shows the events correctly with\n> > the strings showing parameters.\n> >\n> > Before the fix:\n> >\n> > # ./perf list|grep -w PM_PAU_CYC\n> > hv_24x7/PM_PAU_CYC/ [Kernel PMU event]\n> >\n> > With this fix:\n> >\n> > # ./perf list|grep -w PM_PAU_CYC\n> > hv_24x7/PM_PAU_CYC,chip=?/ [Kernel PMU event]\n> >\n> > Signed-off-by: Athira Rajeev \n>\n> Tested-by: Venkat Rao Bagalkote \n\nReviewed-by: Ian Rogers \n\nThanks,\nIan\n\n> > ---\n> > Changelog:\n> > v3 -> v4:\n> > Updated commit message to show real example\n> > addressing review comment from Namhyung.\n> >\n> > v2 -> v3:\n> > Split the strstr correction in a single patch\n> >\n> > tools/perf/util/pmu.c | 2 +-\n> > 1 file changed, 1 insertion(+), 1 deletion(-)\n> >\n> > diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c\n> > index 23337d2fa281..0b8d58543f17 100644\n> > --- a/tools/perf/util/pmu.c\n> > +++ b/tools/perf/util/pmu.c\n> > @@ -2117,7 +2117,7 @@ static char *format_alias(char *buf, int len, const struct perf_pmu *pmu,\n> > skip_duplicate_pmus);\n> >\n> > /* Paramemterized events have the parameters shown. */\n> > - if (strstr(alias->terms, \"=?\")) {\n> > + if (!strstr(alias->terms, \"=?\")) {\n> > /* No parameters. */\n> > snprintf(buf, len, \"%.*s/%s/\", (int)pmu_name_len, pmu->name, alias->name);\n> > return buf;\n> > --\n> > 2.47.3\n> >\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20251104 header.b=h8mSu9DL;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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