linux-kernel - [PATCH -tip v3 2/5] perf: change perf_event_header.misc to PERF_RECORD_MISC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 11 Aug 2011 21:06:20 +0900
From:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	yrl.pp-manager.tt@...achi.com,
	Akihiro Nagai <akihiro.nagai.hw@...achi.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	David Ahern <dsahern@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: [PATCH -tip v3 2/5] perf: change perf_event_header.misc to
 PERF_RECORD_MISC_USER for BTS

Change perf_event_headder.misc to PERF_RECORD_MISC_USER for
BTS records, because BTS traces both kernel and user spaces
nevertheless perf specifies to trace only kernel or user space.

Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
---

 arch/x86/kernel/cpu/perf_event_intel_ds.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 1b1ef3a..323f3f0 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -340,6 +340,14 @@ static int intel_pmu_drain_bts_buffer(void)
 	 */
 	perf_prepare_sample(&header, &data, event, &regs);
 
+	/*
+	 * Since BTS can not trace kernel and user space separately, set
+	 * PERF_RECORD_MISC_USER in header.misc to resolve both kernel and
+	 * user DSOs and symbols.
+	 */
+	header.misc &= ~PERF_RECORD_MISC_CPUMODE_MASK;
+	header.misc |= PERF_RECORD_MISC_USER;
+
 	if (perf_output_begin(&handle, event, header.size * (top - at)))
 		return 1;
 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/