lkml.org 
[lkml]   [2010]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[RFC][PATCH v2 10/11] perf: core, lookup pmu via sysfs
From
Date
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@intel.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
*/





\
 
 \ /
  Last update: 2010-05-18 19:53    [W:0.029 / U:0.364 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site