Steven Rostedt 93459c6cb9 tracing: only add splice page if entries exist ...

The splice code allocates a page even when the ring buffer is empty.
It detects the ring buffer being empty when it it fails to copy
anything from the ring buffer into the page.

This patch adds a check to see if there is anything in the ring buffer
before allocating a page.

Thanks to logdev for letting me trace the tracer to find this.

[ Impact: speed up due to removing unnecessary allocation ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2009-04-29 00:23:13 -04:00

..

blktrace.c

blktrace: fix context-info when mixed-using blk tracer and trace events

2009-04-16 10:11:01 +02:00

ftrace.c

ftrace: use module notifier for function tracer

2009-04-17 16:59:15 +02:00

Kconfig

tracing: rename EVENT_TRACER config to ENABLE_EVENT_TRACING

2009-04-20 17:55:35 +02:00

kmemtrace.c

tracing/filters: use ring_buffer_discard_commit() in filter_check_discard()

2009-04-14 00:00:56 +02:00

Makefile

tracing/events: move the ftrace event tracing code to core

2009-04-14 12:57:59 -04:00

ring_buffer.c

ring_buffer: compressed event header

2009-04-24 00:08:38 -04:00

trace_boot.c

tracing: use macros to denote usec and nsec per second

2009-04-07 14:43:06 +02:00

trace_branch.c

tracing/filters: use ring_buffer_discard_commit() in filter_check_discard()

2009-04-14 00:00:56 +02:00

trace_clock.c

tracing: fix four sparse warnings

2009-03-22 18:16:54 +01:00

trace_event_profile.c

tracing/events: convert event call sites to use a link list

2009-04-14 12:58:00 -04:00

trace_event_types.h

tracing/filters: add TRACE_EVENT_FORMAT_NOFILTER event macro

2009-04-14 00:00:51 +02:00

trace_events_filter.c

tracing/filters: allow user-input to be integer-like string

2009-04-21 11:58:28 +02:00

trace_events.c

tracing/events: make modules have their own file_operations structure

2009-04-26 13:07:00 +02:00

trace_export.c

tracing: add size checks for exported ftrace internal structures

2009-04-23 23:03:56 -04:00

trace_functions_graph.c

function-graph: add option to calculate graph time or not

2009-03-24 23:41:11 -04:00

trace_functions.c

tracing/core: use appropriate waiting on trace_pipe

2009-02-18 01:40:20 +01:00

trace_hw_branches.c

tracing/filters: use ring_buffer_discard_commit() in filter_check_discard()

2009-04-14 00:00:56 +02:00

trace_irqsoff.c

tracing: have latency tracers set the latency format

2009-03-04 22:15:30 -05:00

trace_mmiotrace.c

tracing: use macros to denote usec and nsec per second

2009-04-07 14:43:06 +02:00

trace_nop.c

tracing/ftrace: make nop-tracer use polling wait for events on pipe

2009-03-23 09:22:15 +01:00

trace_output.c

tracing/events: reuse trace event ids after overflow

2009-04-24 23:06:00 -04:00

trace_output.h

tracing/events: move declarations from trace directory to core include

2009-04-14 12:57:58 -04:00

trace_power.c

tracing/filters: use ring_buffer_discard_commit() in filter_check_discard()

2009-04-14 00:00:56 +02:00

trace_printk.c

tracing/ftrace: factorize the tracing files creation

2009-04-07 14:43:07 +02:00

trace_sched_switch.c

tracing/events: move trace point headers into include/trace/events

2009-04-14 22:05:43 -04:00

trace_sched_wakeup.c

tracing/wakeup: move access to wakeup_cpu into spinlock

2009-04-23 23:01:36 -04:00

trace_selftest_dynamic.c

ftrace: fix dynamic ftrace selftest

2008-05-23 21:13:23 +02:00

trace_selftest.c

tracing: keep the tracing buffer after self-test failure

2009-03-22 15:17:21 +01:00

trace_stack.c

tracing/ftrace: factorize the tracing files creation

2009-04-07 14:43:07 +02:00

trace_stat.c

Merge branch 'linus' into tracing/core

2009-04-07 13:47:45 +02:00

trace_stat.h

tracing: add handler to trace_stat

2009-03-24 23:22:58 -04:00

trace_syscalls.c

tracing/syscalls: use a dedicated file header

2009-04-09 05:43:32 +02:00

trace_sysprof.c

tracing/ftrace: factorize the tracing files creation

2009-04-07 14:43:07 +02:00

trace_workqueue.c

Merge branch 'linus' into tracing/core

2009-04-07 13:47:45 +02:00

trace.c

tracing: only add splice page if entries exist

2009-04-29 00:23:13 -04:00

trace.h

tracing/events: make struct trace_entry->type to be int type

2009-04-22 11:36:38 +02:00