Matt Macy 6f06a36d47 MFV/ZoL: add dbuf stats ... NB: disabled pending the addition of KSTAT_TYPE_RAW support to the SPL commit e0b0ca983d Author: Brian Behlendorf <behlendorf1@llnl.gov> Date: Wed Oct 2 17:11:19 2013 -0700 Add visibility in to cached dbufs Currently there is no mechanism to inspect which dbufs are being cached by the system. There are some coarse counters in arcstats by they only give a rough idea of what's being cached. This patch aims to improve the current situation by adding a new dbufs kstat. When read this new kstat will walk all cached dbufs linked in to the dbuf_hash. For each dbuf it will dump detailed information about the buffer. It will also dump additional information about the referenced arc buffer and its related dnode. This provides a more complete view in to exactly what is being cached. With this generic infrastructure in place utilities can be written to post-process the data to understand exactly how the caching is working. For example, the data could be processed to show a list of all cached dnodes and how much space they're consuming. Or a similar list could be generated based on dnode type. Many other ways to interpret the data exist based on what kinds of questions you're trying to answer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Prakash Surya <surya1@llnl.gov>		2018-08-12 01:10:18 +00:00
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kern	This originated from ZFS On Linux, as	2018-06-08 17:38:28 +00:00
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sys	MFV/ZoL: add dbuf stats	2018-08-12 01:10:18 +00:00