c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2026-05-22 10:37:35 +03:00
Code Issues Packages Projects Releases Wiki Activity

Decouple arc_read_done callback from arc buf instantiation

Browse Source 
Add ARC_FLAG_NO_BUF to indicate that a buffer need not be
instantiated.  This fixes a ~20% performance regression on
cached reads due to zfetch changes.

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #11220 
Closes #11232
This commit is contained in:
Matthew Macy
2020-12-09 15:05:06 -08:00
committed by GitHub
parent edb20ff3ba
commit 1e4732cbda
3 changed files with 10 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/arc.h
+5
View File
@@ -154,6 +154,11 @@ typedef enum arc_flags
*/
ARC_FLAG_CACHED_ONLY = 1 << 22,
/*
* Don't instantiate an arc_buf_t for arc_read_done.
*/
ARC_FLAG_NO_BUF = 1 << 23,
/*
* The arc buffer's compression mode is stored in the top 7 bits of the
* flags field, so these dummy flags are included so that MDB can