GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-27 00:51:35 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

perf_counter: Change data head from u32 to u64

Browse source 
Since some people worried that 4G might not be a large enough
as an mmap data window, extend it to 64 bit for capable
platforms.

Reported-by: Stephane Eranian <eranian@googlemail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-02 16:16:02 +02:00 • committed by Ingo Molnar
parent e4abb5d4f7
commit 8e3747c13c
2 changed files with 12 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

7
include/linux/perf_counter.h
View file

@ -212,7 +212,7 @@ struct perf_counter_mmap_page {
* User-space reading this value should issue an rmb(), on SMP capable
* platforms, after reading this value -- see perf_counter_wakeup().
*/
__u32 data_head; /* head in the data section */
__u64 data_head; /* head in the data section */
};
#define PERF_EVENT_MISC_CPUMODE_MASK (3 << 0)
@ -397,10 +397,11 @@ struct perf_mmap_data {
int nr_locked; /* nr pages mlocked */
atomic_t poll; /* POLL_ for wakeups */
atomic_t head; /* write position */
atomic_t events; /* event limit */
atomic_t done_head; /* completed head */
atomic_long_t head; /* write position */
atomic_long_t done_head; /* completed head */
atomic_t lock; /* concurrent writes */
atomic_t wakeup; /* needs a wakeup */