Alexander Motin 6b88b4b501 Remove b_pabd/b_rabd allocation from arc_hdr_alloc() ... When a header is allocated for full overwrite it is a waste of time to allocate b_pabd/b_rabd for it, since arc_write() will free them without ever being touched. If it is a read or a partial overwrite then arc_read() and arc_hdr_decrypt() allocate them explicitly. Reduced memory allocation in user threads also reduces ARC eviction throttling there, proportionally increasing it in ZIO threads, that is not good. To minimize or even avoid it introduce ARC allocation reserve, allowing certain arc_get_data_abd() callers to allocate a bit longer in situations where user threads will already throttle. Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #12398		2021-08-17 10:15:54 -06:00
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freebsd	Remove b_pabd/b_rabd allocation from arc_hdr_alloc()	2021-08-17 10:15:54 -06:00
linux	Remove b_pabd/b_rabd allocation from arc_hdr_alloc()	2021-08-17 10:15:54 -06:00