> >>> +int perf_mmap__read_catchup(struct perf_mmap *map,
> >>> + bool overwrite,
> >>> + u64 *start, u64 *end,
> >>> + unsigned long *size)
> >>>{
> >>> - u64 head;
> >>> + u64 head = perf_mmap__read_head(map);
> >>> + u64 old = map->
On 2017/12/19 3:07, Liang, Kan wrote:
-union perf_event *perf_mmap__read_backward(struct perf_mmap *map)
+union perf_event *perf_mmap__read_backward(struct perf_mmap *map,
+ u64 *start, u64 end)
{
- u64 head, end;
- u64 start = map->prev;
> > -union perf_event *perf_mmap__read_backward(struct perf_mmap *map)
> > +union perf_event *perf_mmap__read_backward(struct perf_mmap *map,
> > + u64 *start, u64 end)
> > {
> > - u64 head, end;
> > - u64 start = map->prev;
> > -
> > - /*
> > -* Ch
On 2017/12/7 7:32, kan.li...@intel.com wrote:
From: Kan Liang
perf_mmap__read_catchup and perf_mmap__read_backward are used to read
events one by one from ring buffer under overwrite mode.
It always read the stale buffer which is already processed.
Because the previous location of processed r
From: Kan Liang
perf_mmap__read_catchup and perf_mmap__read_backward are used to read
events one by one from ring buffer under overwrite mode.
It always read the stale buffer which is already processed.
Because the previous location of processed ring buffer is discarded.
Introducing the perf_mma
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