Alexander Motin ba7797c8db ARC: Remove b_bufcnt/b_ebufcnt from ARC headers ... In most cases we do not care about exact number of buffers linked to the header, we just need to know if it is zero, non-zero or one. That can easily be checked just looking on b_buf pointer or in some cases derefencing it. b_ebufcnt is read only once, and in that case we already traverse the list as part of arc_buf_remove(), so second traverse should not be expensive. This reduces L1 ARC header size by 8 bytes and full crypto header by 16 bytes, down to 176 and 232 bytes on FreeBSD respectively. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15350		2023-10-07 09:08:20 -07:00
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sys	ARC: Remove b_bufcnt/b_ebufcnt from ARC headers	2023-10-07 09:08:20 -07:00