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Sun, 8 Apr 2018 20:26:39 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Peter Zijlstra , Alexander Shishkin , Arnaldo Carvalho de Melo , Jiri Olsa , Linus Torvalds , Stephane Eranian , Thomas Gleixner , Vince Weaver , Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 006/293] perf/core: Correct event creation with PERF_FORMAT_GROUP Thread-Topic: [PATCH AUTOSEL for 4.9 006/293] perf/core: Correct event creation with PERF_FORMAT_GROUP Thread-Index: AQHTz5jlREnPcUaLyECsKahc5X+CJg== Date: Mon, 9 Apr 2018 00:22:51 +0000 Message-ID: <20180409002239.163177-6-alexander.levin@microsoft.com> References: <20180409002239.163177-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002239.163177-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1015;7:fPsr7eczgChn7HgEMVXP+iagAHoSr9SGT1M1xWxLOmCoLicyvgbMC594MnW6dwuZYDgyFv3RF81N8ELd5kbtPXCHcBYqXjkBOSp5sAlXmhrq61qbZ630mQweYEkgf+mKJF8z28gF9qUhiA3iMW8skLWJj7SPUNgFqxeYd1bYuZQCqzVGssUfQo42VzuKilscwIbehvZk3vsl6ghe1BcUJGLw7XV5I0HOrg8LO+tNtPyMieerkWLY7Mwv6YhmMewz;20:G99FHXz/fwrZSltwnDbF2kzDle9b0zwSM+hs1ktFVEj0mplew6lyBENOu8CfdNM4FdTrYCMcKyrNCOQSsZpvukuiHMUwAfU74LGyLXR3bSymtyPPCxOYB+C7RH/TpeKNgKnz3j4ohYsDtTTfkD/KO0nPEObMEx70sVRKsDHJ0kw= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: fcb9a3b4-dffe-4b27-b990-08d59db08c26 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1015; 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it was previously possible to create an inherited event with PERF_SAMPLE_READ; this is deemed acceptible because its results were always incorrect. Reported-by: Andi Kleen Signed-off-by: Peter Zijlstra (Intel) Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Fixes: 3dab77fb1bf8 ("perf: Rework/fix the whole read vs group stuff") Link: http://lkml.kernel.org/r/20170530094512.dy2nljns2uq7qa3j@hirez.progra= mming.kicks-ass.net Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/events/core.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 13b9784427b0..4d6f2cd59696 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5669,9 +5669,6 @@ static void perf_output_read_one(struct perf_output_h= andle *handle, __output_copy(handle, values, n * sizeof(u64)); } =20 -/* - * XXX PERF_FORMAT_GROUP vs inherited events seems difficult. - */ static void perf_output_read_group(struct perf_output_handle *handle, struct perf_event *event, u64 enabled, u64 running) @@ -5716,6 +5713,13 @@ static void perf_output_read_group(struct perf_outpu= t_handle *handle, #define PERF_FORMAT_TOTAL_TIMES (PERF_FORMAT_TOTAL_TIME_ENABLED|\ PERF_FORMAT_TOTAL_TIME_RUNNING) =20 +/* + * XXX PERF_SAMPLE_READ vs inherited events seems difficult. + * + * The problem is that its both hard and excessively expensive to iterate = the + * child list, not to mention that its impossible to IPI the children runn= ing + * on another CPU, from interrupt/NMI context. + */ static void perf_output_read(struct perf_output_handle *handle, struct perf_event *event) { @@ -9259,9 +9263,10 @@ perf_event_alloc(struct perf_event_attr *attr, int c= pu, local64_set(&hwc->period_left, hwc->sample_period); =20 /* - * we currently do not support PERF_FORMAT_GROUP on inherited events + * We currently do not support PERF_SAMPLE_READ on inherited events. + * See perf_output_read(). */ - if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP)) + if (attr->inherit && (attr->sample_type & PERF_SAMPLE_READ)) goto err_ns; =20 if (!has_branch_stack(event)) --=20 2.15.1