linux-kernel - [PATCH V2 2/4] perf/x86: introduce read function for x86

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]

Message-Id: <1513798971-4257-3-git-send-email-kan.liang@linux.intel.com>
Date:   Wed, 20 Dec 2017 11:42:49 -0800
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, jolsa@...hat.com, eranian@...gle.com,
        ak@...ux.intel.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V2 2/4] perf/x86: introduce read function for x86_pmu

From: Kan Liang <kan.liang@...ux.intel.com>

Large PEBS need to be specially handled in event count read.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/core.c       | 2 ++
 arch/x86/events/perf_event.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 140d332..acd7ffc 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1884,6 +1884,8 @@ early_initcall(init_hw_perf_events);
 
 static inline void x86_pmu_read(struct perf_event *event)
 {
+	if (x86_pmu.read)
+		return x86_pmu.read(event);
 	x86_perf_event_update(event);
 }
 
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index f7aaadf..67426e51 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -534,6 +534,7 @@ struct x86_pmu {
 	void		(*disable)(struct perf_event *);
 	void		(*add)(struct perf_event *);
 	void		(*del)(struct perf_event *);
+	void		(*read)(struct perf_event *event);
 	int		(*hw_config)(struct perf_event *event);
 	int		(*schedule_events)(struct cpu_hw_events *cpuc, int n, int *assign);
 	unsigned	eventsel;
-- 
2.7.4