Commit 5b1dbd17 authored Apr 21, 2015 by Alexander Shishkin Committed by Ingo Molnar May 27, 2015

perf/x86/intel/pt: Document pt_buffer_reset_offsets()



Currently, the description of pt_buffer_reset_offsets() lacks information
about its calling constraints and ordering with regards to other buffer
management functions.

Add a clarification about when this function has to be called.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@infradead.org
Cc: adrian.hunter@intel.com
Cc: hpa@zytor.com
Link: http://lkml.kernel.org/r/1429622177-22843-5-git-send-email-alexander.shishkin@linux.intel.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent cf302bfd

arch/x86/kernel/cpu/perf_event_intel_pt.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -705,7 +705,14 @@ static void pt_buffer_setup_topa_index(struct pt_buffer *buf)
		* @head: Write pointer (aux_head) from AUX buffer.
		*
		* Find the ToPA table and entry corresponding to given @head and set buffer's
		* "current" pointers accordingly.
		* "current" pointers accordingly. This is done after we have obtained the
		* current aux_head position from a successful call to perf_aux_output_begin()
		* to make sure the hardware is writing to the right place.
		*
		* This function modifies buf::{cur,cur_idx,output_off} that will be programmed
		* into PT msrs when the tracing is enabled and buf::head and buf::data_size,
		* which are used to determine INT and STOP markers' locations by a subsequent
		* call to pt_buffer_reset_markers().
		*/
		static void pt_buffer_reset_offsets(struct pt_buffer *buf, unsigned long head)
		{