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42584c81c5
linux/kernel/trace
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Yoshihiro YUNOMAE 42584c81c5 tracing: Have saved_cmdlines use the seq_read infrastructure 
Current tracing_saved_cmdlines_read() implementation is naive; It allocates
a large buffer, constructs output data to that buffer for each read
operation, and then copies a portion of the buffer to the user space
buffer. This has several issues such as slow memory allocation, high
CPU usage, and even corruption of the output data.

The seq_read infrastructure is made to handle this type of work.
By converting it to use seq_read() the code becomes smaller, simplified,
as well as correct.

Link: http://lkml.kernel.org/p/20140220084431.3839.51793.stgit@yunodevel

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2014-05-29 23:08:07 -04:00
..
blktrace.c Most of the changes were largely clean ups, and some documentation. 2014-04-03 10:26:31 -07:00
ftrace.c ftrace: Remove FTRACE_UPDATE_MODIFY_CALL_REGS flag 2014-05-14 11:37:30 -04:00
Kconfig tracing: Add tracepoint benchmark tracepoint 2014-05-29 22:49:54 -04:00
Makefile tracing: Add tracepoint benchmark tracepoint 2014-05-29 22:49:54 -04:00
power-traces.c PM / tracing: remove deprecated power trace API 2013-01-26 00:39:12 +01:00
ring_buffer_benchmark.c trace: Replace hardcoding of 19 with MAX_NICE 2014-02-27 12:41:03 +01:00
ring_buffer.c trace, ring-buffer: Fix CPU hotplug callback registration 2014-03-20 13:43:48 +01:00
rpm-traces.c PM / Runtime: Introduce trace points for tracing rpm_* functions 2011-09-27 22:53:27 +02:00
trace_benchmark.c tracing: Add tracepoint benchmark tracepoint 2014-05-29 22:49:54 -04:00
trace_benchmark.h tracing: Add tracepoint benchmark tracepoint 2014-05-29 22:49:54 -04:00
trace_branch.c tracing: Update event filters for multibuffer 2013-11-05 16:50:20 -05:00
trace_clock.c tracing: Add "uptime" trace clock that uses jiffies 2013-03-15 00:36:09 -04:00
trace_entries.h tracing: Add trace_puts() for even faster trace_printk() tracing 2013-03-15 00:35:55 -04:00
trace_event_perf.c perf: Disallow user-space stack dumps for function trace events 2014-03-11 11:57:58 +01:00
trace_events_filter_test.h tracing/filter: Add startup tests for events filter 2011-08-19 14:35:59 -04:00
trace_events_filter.c tracing: Add and use generic set_trigger_filter() implementation 2013-12-21 22:02:17 -05:00
trace_events_trigger.c tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints 2014-04-08 20:43:28 -04:00
trace_events.c tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints 2014-04-08 20:43:28 -04:00
trace_export.c tracing: Fix anonymous unions in struct ftrace_event_call 2014-04-09 20:02:55 -04:00
trace_functions_graph.c tracing: Add funcgraph_tail option to print function name after closing braces 2014-05-20 23:29:32 -04:00
trace_functions.c tracing: Remove mock up poll wait function 2014-04-30 08:40:05 -04:00
trace_irqsoff.c tracing: Allow irq/preempt tracers to be used by instances 2014-04-21 13:59:29 -04:00
trace_kdb.c tracing: Consolidate max_tr into main trace_array structure 2013-03-15 00:35:40 -04:00
trace_kprobe.c tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints 2014-04-08 20:43:28 -04:00
trace_mmiotrace.c tracing: Update event filters for multibuffer 2013-11-05 16:50:20 -05:00
trace_nop.c tracing: Remove mock up poll wait function 2014-04-30 08:40:05 -04:00
trace_output.c tracing: Add __bitmask() macro to trace events to cpumasks and other bitmasks 2014-05-15 11:29:37 -04:00
trace_output.h tracing: Rename trace_event_mutex to trace_event_sem 2013-03-15 13:22:10 -04:00
trace_printk.c tracing: Add __tracepoint_string() to export string pointers 2013-07-26 13:39:44 -04:00
trace_probe.c tracing/uprobes: Add @+file_offset fetch method 2014-01-02 20:57:05 -05:00
trace_probe.h tracing/uprobes: Support ftrace_event_file base multibuffer 2014-02-20 12:30:09 -05:00
trace_sched_switch.c tracing: Update event filters for multibuffer 2013-11-05 16:50:20 -05:00
trace_sched_wakeup.c tracing: Remove mock up poll wait function 2014-04-30 08:40:05 -04:00
trace_selftest_dynamic.c ftrace: Add self-tests for multiple function trace users 2011-05-18 19:24:51 -04:00
trace_selftest.c tracing: Add static to local functions 2014-04-21 14:00:46 -04:00
trace_stack.c tracing/stack_trace: Skip 4 instead of 3 when using ftrace_ops_list_func 2014-04-24 13:36:03 -04:00
trace_stat.c trace/trace_stat: use rbtree postorder iteration helper instead of opencoding 2013-11-05 16:01:47 -05:00
trace_stat.h
trace_syscalls.c tracing: Consolidate event trigger code 2014-01-09 21:20:07 -05:00
trace_uprobe.c tracing/uprobes: Fix uprobe_cpu_buffer memory leak 2014-04-17 10:44:42 -04:00
trace.c tracing: Have saved_cmdlines use the seq_read infrastructure 2014-05-29 23:08:07 -04:00
trace.h tracing: Add funcgraph_tail option to print function name after closing braces 2014-05-20 23:29:32 -04:00