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authorFrederic Weisbecker <fweisbec@gmail.com>2009-09-18 06:10:28 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2009-09-18 07:25:44 +0200
commit20ab4425a77a1f34028cc6ce57053c22c184ba5f (patch)
treeca821b19593c3821fa13a520201537ad35e4c98d /fs/ecryptfs
parente5e25cf47b0bdd1f7e9b8bb6368ee48e16de0c87 (diff)
tracing: Allocate the ftrace event profile buffer dynamically
Currently the trace event profile buffer is allocated in the stack. But this may be too much for the stack, as the events can have large statically defined field size and can also grow with dynamic arrays. Allocate two per cpu buffer for all profiled events. The first cpu buffer is used to host every non-nmi context traces. It is protected by disabling the interrupts while writing and committing the trace. The second buffer is reserved for nmi. So that there is no race between them and the first buffer. The whole write/commit section is rcu protected because we release these buffers while deactivating the last profiling trace event. v2: Move the buffers from trace_event to be global, as pointed by Steven Rostedt. v3: Fix the syscall events to handle the profiling buffer races by disabling interrupts, now that the buffers are globals. Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs/ecryptfs')
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