Steven Rostedt 3eefae994d ftrace: limit trace entries ... Currently there is no protection from the root user to use up all of memory for trace buffers. If the root user allocates too many entries, the OOM killer might start kill off all tasks. This patch adds an algorith to check the following condition: pages_requested > (freeable_memory + current_trace_buffer_pages) / 4 If the above is met then the allocation fails. The above prevents more than 1/4th of freeable memory from being used by trace buffers. To determine the freeable_memory, I made determine_dirtyable_memory in mm/page-writeback.c global. Special thanks goes to Peter Zijlstra for suggesting the above calculation. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2008-05-23 22:05:14 +02:00
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ftrace.c	ftrace: use raw_smp_processor_id for mcount functions	2008-05-23 22:01:34 +02:00
Kconfig	ftrace: restrict tracing to HAVE_FTRACE architectures	2008-05-23 21:15:29 +02:00
Makefile	ftrace: fix dynamic ftrace selftest	2008-05-23 21:13:23 +02:00
trace_functions.c	ftrace: fix comm on function trace output	2008-05-23 21:52:12 +02:00
trace_irqsoff.c	ftrace: irqsoff use raw_smp_processor_id	2008-05-23 21:13:41 +02:00
trace_sched_switch.c	ftrace: fix comm on function trace output	2008-05-23 21:52:12 +02:00
trace_sched_wakeup.c	ftrace: printk and trace irqsoff and wakeups	2008-05-23 21:13:02 +02:00
trace_selftest_dynamic.c	ftrace: fix dynamic ftrace selftest	2008-05-23 21:13:23 +02:00
trace_selftest.c	ftrace: user proper API for setting RT prios in selftest	2008-05-23 21:49:42 +02:00
trace.c	ftrace: limit trace entries	2008-05-23 22:05:14 +02:00
trace.h	ftrace: add readpos to struct trace_seq; add trace_seq_to_user()	2008-05-23 22:02:13 +02:00