Messages in this thread Patch in this message | | | Date | Fri, 23 Jul 2010 12:10:03 GMT | From | tip-bot for Richard Kennedy <> | Subject | [tip:perf/core] trace: Reorder struct ring_buffer_per_cpu to remove padding on 64bit |
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Commit-ID: 985023dee6e212493831431ba2e3ce8918f001b2 Gitweb: http://git.kernel.org/tip/985023dee6e212493831431ba2e3ce8918f001b2 Author: Richard Kennedy <richard@rsk.demon.co.uk> AuthorDate: Thu, 25 Mar 2010 11:27:36 +0000 Committer: Steven Rostedt <rostedt@goodmis.org> CommitDate: Tue, 20 Jul 2010 21:58:44 -0400
trace: Reorder struct ring_buffer_per_cpu to remove padding on 64bit
Reorder structure to remove 8 bytes of padding on 64 bit builds. This shrinks the size to 128 bytes so allowing allocation from a smaller slab & needed one fewer cache lines.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> LKML-Reference: <1269516456.2054.8.camel@localhost> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- 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 28d0615..3632ce8 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -443,6 +443,7 @@ int ring_buffer_print_page_header(struct trace_seq *s) */ struct ring_buffer_per_cpu { int cpu; + atomic_t record_disabled; struct ring_buffer *buffer; spinlock_t reader_lock; /* serialize readers */ arch_spinlock_t lock; @@ -462,7 +463,6 @@ struct ring_buffer_per_cpu { unsigned long read; u64 write_stamp; u64 read_stamp; - atomic_t record_disabled; }; struct ring_buffer {
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