Stefan Hajnoczi 0b5538c300 simpletrace: Thread-safe tracing ... Trace events outside the global mutex cannot be used with the simple trace backend since it is not thread-safe. There is no check to prevent them being enabled so people sometimes learn this the hard way. This patch restructures the simple trace backend with a ring buffer suitable for multiple concurrent writers. A writeout thread empties the trace buffer when threshold fill levels are reached. Should the writeout thread be unable to keep up with trace generation, records will simply be dropped. Each time events are dropped a special record is written to the trace file indicating how many events were dropped. The event ID is 0xfffffffffffffffe and its signature is dropped(uint32_t count). Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>		2011-03-07 15:34:17 +00:00
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specs	document QEMU<->ACPIBIOS PCI hotplug interface	2011-01-17 17:29:42 +02:00
blkverify.txt	blkverify: Add block driver for verifying I/O	2010-09-21 17:00:53 +02:00
bootindex.txt	Add boot index documentation.	2011-02-01 16:50:44 -06:00
migration.txt	docs: Improve documentation	2010-10-05 13:53:55 -05:00
qdev-device-use.txt	docs: Document scsi-disk and usb-storage removable parameter	2011-01-24 21:39:22 +01:00
tracing.txt	simpletrace: Thread-safe tracing	2011-03-07 15:34:17 +00:00