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Message-Id: <1274233778.3036.89.camel@localhost>
Date: Wed, 19 May 2010 01:49:38 +0000
From: Lin Ming <ming.m.lin@...el.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>,
Paul Mundt <lethal@...ux-sh.org>,
"eranian@...il.com" <eranian@...il.com>,
"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
Paul Mackerras <paulus@...ba.org>,
"David S. Miller" <davem@...emloft.net>,
Russell King <rmk+kernel@....linux.org.uk>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Will Deacon <will.deacon@....com>,
Maynard Johnson <mpjohn@...ibm.com>,
Carl Love <carll@...ibm.com>,
"greg@...ah.com" <greg@...ah.com>,
Kay Sievers <kay.sievers@...y.org>,
lkml <linux-kernel@...r.kernel.org>
Subject: [RFC][PATCH v2 10/11] perf: core, lookup pmu via sysfs
Add another pmu lookup method via sysfs.
Now we have 2 methods: type->pmu and sys_fd->pmu
Changes log,
Lookup pmu via sysfs (Ingo Molnar)
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
kernel/perf_event.c | 33 ++++++++++++++++++++++++++++++++-
1 files changed, 32 insertions(+), 1 deletions(-)
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 8640610..0ab4a8b 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4680,7 +4680,7 @@ static struct pmu *sw_perf_event_init(struct perf_event *event)
return pmu;
}
-static struct pmu *perf_event_lookup_pmu(struct perf_event *event)
+static struct pmu *perf_event_lookup_pmu_by_type(struct perf_event *event)
{
struct pmu *pmu = NULL;
int pmu_id = PERF_EVENT_ATTR_TYPE(&event->attr);
@@ -4708,6 +4708,37 @@ static struct pmu *perf_event_lookup_pmu(struct perf_event *event)
return pmu;
}
+static struct pmu *perf_event_lookup_pmu_by_fd(struct perf_event *event)
+{
+ struct pmu *pmu = NULL;
+ struct kobject *kobj;
+ int sys_fd = PERF_EVENT_ATTR_FD(&event->attr);
+ struct file *file;
+ int fput_needed;
+
+ file = fget_light(sys_fd, &fput_needed);
+ if (!file)
+ return NULL;
+
+ kobj = sysfs_get_kobject(file);
+ if (kobj)
+ pmu = container_of(kobj, struct pmu, kobj);
+
+ fput_light(file, fput_needed);
+
+ return pmu;
+}
+
+static struct pmu *perf_event_lookup_pmu(struct perf_event *event)
+{
+ u32 type = event->attr.type;
+
+ if (type & PERF_EVENT_FD)
+ return perf_event_lookup_pmu_by_fd(event);
+ else
+ return perf_event_lookup_pmu_by_type(event);
+}
+
/*
* Allocate and initialize a event structure
*/
--
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