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| author | Steven Rostedt <srostedt@redhat.com> | 2009-06-11 15:29:58 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-06-17 03:19:23 +0200 |
| commit | 22f470f8daea64bc03be1fe30c8c5df382295386 (patch) | |
| tree | 3186ae50783f1795307055d48a583e23e2e21ad2 /kernel/trace/ring_buffer.c | |
| parent | tracing: update sample event documentation (diff) | |
| download | linux-22f470f8daea64bc03be1fe30c8c5df382295386.tar.xz linux-22f470f8daea64bc03be1fe30c8c5df382295386.zip | |
ring-buffer: use BUF_PAGE_HDR_SIZE in calculating index
The index of the event is found by masking PAGE_MASK to it and
subtracting the header size. Currently the header size is calculate
by PAGE_SIZE - BUF_PAGE_SIZE, when we already have a macro
BUF_PAGE_HDR_SIZE to define it.
If we want to change BUF_PAGE_SIZE to something less than filling
the rest of the page (this is done for debugging), then we break
the algorithm to find the index.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
| -rw-r--r-- | kernel/trace/ring_buffer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index ed3559944fcf..6b17a11e42a2 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1013,7 +1013,7 @@ rb_event_index(struct ring_buffer_event *event) { unsigned long addr = (unsigned long)event; - return (addr & ~PAGE_MASK) - (PAGE_SIZE - BUF_PAGE_SIZE); + return (addr & ~PAGE_MASK) - BUF_PAGE_HDR_SIZE; } static inline int |