[Xen-devel] Scheduler stats and some doubts

To:	xen-devel@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-devel] Scheduler stats and some doubts
From:	Marco Tizzoni <marco.tizzoni@xxxxxxxxx>
Date:	Sat, 12 Sep 2009 17:39:17 +0200
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Hello,
someone can tell me how to enable scheduler statistics and how to display them?

I found this comment:

---------------------------------------
/*
 * CSCHED_STATS
 *
 * Manage very basic per-vCPU counters and stats.
 *
 * Useful for debugging live systems. The stats are displayed
 * with runq dumps ('r' on the Xen console).
 */
#ifdef PERF_COUNTERS
#define CSCHED_STATS
#endif
---------------------------------------

I've just enabled this in Rules.mk:
---------------------------------------
verbose       ?= y
perfc         ?= y
perfc_arrays  ?= y
---------------------------------------

now xenperf works but I don't know how to access the "Xen console".

Also, not related to this issue, I'm interested in accounting how many
ticks the net backend driver spends in rx/tx.
Can it make sense using the getrusage() function at start/end of
net_rx_action()/net_tx_action() or it can lead to unconsistent
accounting?

Is there a better way?

Any suggestions are welcome.

Thanks in advance.
Marco

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[Xen-devel] Scheduler stats and some doubts