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authorSteven Rostedt <rostedt@goodmis.org>2008-05-12 21:21:04 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-05-23 22:05:14 +0200
commit3eefae994d9224fb7771a3ddb683868363c23510 (patch)
tree0c7fe35765b485ff2a155c4ae1189199476a34b3 /kernel/marker.c
parent6c6c27969a4c6024e6c8838829546c02aaddca18 (diff)
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>
Diffstat (limited to 'kernel/marker.c')
0 files changed, 0 insertions, 0 deletions