On Sat, 2009-09-19 at 10:06 +0000, tip-bot for Frederic Weisbecker wrote: > Commit-ID: 20ab4425a77a1f34028cc6ce57053c22c184ba5f > Gitweb: http://git.kernel.org/tip/20ab4425a77a1f34028cc6ce57053c22c184ba5f > Author: Frederic Weisbecker <fweisbec@xxxxxxxxx> > AuthorDate: Fri, 18 Sep 2009 06:10:28 +0200 > Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx> > CommitDate: Fri, 18 Sep 2009 07:25:44 +0200 > > 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. OK, now I'm confused ;-) This version looks like the correct one. -- Steve > > 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@xxxxxxxxxxx> > Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx> > Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Li Zefan <lizf@xxxxxxxxxxxxxx> > Cc: Jason Baron <jbaron@xxxxxxxxxx> > Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> > Cc: Ingo Molnar <mingo@xxxxxxx> > -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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