Steven Hartland 78ad0c1c80 Improve TXG handling in the TRIM module. ... This patch adds some improvements to the way the trim module considers TXGs: - Free ZIOs are registered with the TXG from the ZIO itself, not the current SPA syncing TXG (which may be out of date); - L2ARC are registered with a zero TXG number, as L2ARC has no concept of TXGs; - The TXG limit for issuing TRIMs is now computed from the last synced TXG, not the currently syncing TXG. Indeed, under extremely unlikely race conditions, there is a risk we could trim blocks which have been freed in a TXG that has not finished syncing, resulting in potential data corruption in case of a crash. Reviewed by: pjd (mentor) Approved by: pjd (mentor) Obtained from: 5b46ad40d9 MFC after: 2 weeks		2013-03-21 10:16:10 +00:00
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boot/zfs	MFV r245512:	2013-02-09 06:39:28 +00:00
compat/opensolaris	MFC @248493	2013-03-19 11:09:15 +00:00
contrib/opensolaris	Improve TXG handling in the TRIM module.	2013-03-21 10:16:10 +00:00
dev	Add FBT for PowerPC DTrace. Also, clean up the DTrace assembly code,	2013-03-18 05:30:18 +00:00