Before r305323 (MFV r302991: 6950 ARC should cache compressed data) arc_read() code did this for access to a ghost buffer: arc_adapt() (from arc_get_data_buf()) arc_access(hdr, hash_lock) I.e., we first checked access to the MFU ghost/MRU ghost buffer and adapt MFU/MRU sizes (in arc_adapt()) and next move buffer from the ghost state to regular. After r305323 the sequence is different: arc_access(hdr, hash_lock); arc_hdr_alloc_pabd(hdr); I.e., we first move the buffer from the ghost state in arc_access() and then we check access to buffer in ghost state (in arc_hdr_alloc_pabd() -> arc_get_data_abd() -> arc_get_data_impl() -> arc_adapt()). This is incorrect: arc_adapt() never see access to the ghost buffer because arc_access() already migrated the buffer from the ghost state to regular. So, the fix is to restore a call to arc_adapt() before arc_access() and to suppress the call to arc_adapt() after arc_access(). Submitted by: Slawa Olhovchenkov <slw@zxy.spb.ru> MFC after: 2 weeks Sponsored by: Integros [integros.com] Differential Revision: https://reviews.freebsd.org/D19094 |
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bin | ||
cddl | ||
contrib | ||
crypto | ||
etc | ||
gnu | ||
include | ||
kerberos5 | ||
lib | ||
libexec | ||
release | ||
rescue | ||
sbin | ||
secure | ||
share | ||
stand | ||
sys | ||
targets | ||
tests | ||
tools | ||
usr.bin | ||
usr.sbin | ||
.arcconfig | ||
.arclint | ||
.cirrus.yml | ||
.gitattributes | ||
.gitignore | ||
COPYRIGHT | ||
LOCKS | ||
MAINTAINERS | ||
Makefile | ||
Makefile.inc1 | ||
Makefile.libcompat | ||
Makefile.sys.inc | ||
ObsoleteFiles.inc | ||
README | ||
README.md | ||
UPDATING |
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
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