Steven Hartland 89e5b43079 TRIM cache devices based on time instead of TXGs. ... Currently, the trim module uses the same algorithm for data and cache devices when deciding to issue TRIM requests, based on how far in the past the TXG is. Unfortunately, this is not ideal for cache devices, because the L2ARC doesn't use the concept of TXGs at all. In fact, when using a pool for reading only, the L2ARC is written but the TXG counter doesn't increase, and so no new TRIM requests are issued to the cache device. This patch fixes the issue by using time instead of the TXG number as the criteria for trimming on cache devices. The basic delay principle stays the same, but parameters are expressed in seconds instead of TXGs. The new parameters are named trim_l2arc_limit and trim_l2arc_batch, and both default to 30 second. Reviewed by: pjd (mentor) Approved by: pjd (mentor) Obtained from: 17122c31ac MFC after: 2 weeks		2013-03-21 10:29:05 +00:00
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boot/zfs	MFV r245512:	2013-02-09 06:39:28 +00:00
compat/opensolaris	TRIM cache devices based on time instead of TXGs.	2013-03-21 10:29:05 +00:00
contrib/opensolaris	TRIM cache devices based on time instead of TXGs.	2013-03-21 10:29:05 +00:00
dev	Add FBT for PowerPC DTrace. Also, clean up the DTrace assembly code,	2013-03-18 05:30:18 +00:00