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f9cd8b07a4
freebsd-nq/sys
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Andrey V. Elsukov f9cd8b07a4 Almost each time when loader opens a file, this leads to calling 
disk_open(). Very often this is called several times for one file.
This leads to reading partition table metadata for each call. To
reduce the number of disk I/O we have a simple block cache, but it
is very dumb and more than half of I/O operations related to reading
metadata, misses this cache.

Introduce new cache layer to resolve this problem. It is independent
and doesn't need initialization like bcache, and will work by default
for all loaders which use the new DISK API. A successful disk_open()
call to each new disk or partition produces new entry in the cache.
Even more, when disk was already open, now opening of any nested
partitions does not require reading top level partition table.
So, if without this cache, partition table metadata was read around
20-50 times during boot, now it reads only once. This affects the booting
from GPT and MBR from the UFS.
2012-09-29 16:47:56 +00:00
..
amd64 - Re-shuffle the <machine/pc/bios.h> headers to move all kernel-specific 2012-09-28 11:59:32 +00:00
arm Update a comment to reflect recent locking changes. 2012-09-29 08:11:12 +00:00
boot Almost each time when loader opens a file, this leads to calling 2012-09-29 16:47:56 +00:00
bsm
cam Change queue overflow checks from DIAGNOSTIC+panic() to KASSERT() to make 2012-09-28 12:13:34 +00:00
cddl Merge recent vendor changes in ZFS. 2012-09-26 09:37:58 +00:00
compat Fix the mis-handling of the VV_TEXT on the nullfs vnodes. 2012-09-28 11:25:02 +00:00
conf Improve the check for p4 opened files. 2012-09-22 07:44:36 +00:00
contrib Fix pseudo checksum calculation. 2012-09-27 18:15:01 +00:00
crypto
ddb
dev If devclass_get_devices(9) returns success but a count of 0, 2012-09-29 16:27:13 +00:00
fs Fix the mis-handling of the VV_TEXT on the nullfs vnodes. 2012-09-28 11:25:02 +00:00
gdb
geom Remove the topology lock from disk_gone(), it might be called with regular 2012-09-28 08:22:51 +00:00
gnu/fs Add VFCF_READONLY flag that indicates ntfs and xfs file systems are 2012-09-12 03:42:52 +00:00
i386 - Re-shuffle the <machine/pc/bios.h> headers to move all kernel-specific 2012-09-28 11:59:32 +00:00
ia64 Eliminate a stale comment. It describes another use case for the pmap in 2012-09-28 05:30:59 +00:00
isa
kern Fix the mis-handling of the VV_TEXT on the nullfs vnodes. 2012-09-28 11:25:02 +00:00
kgssapi
libkern s/ is is / is /g 2012-09-14 22:00:03 +00:00
mips Eliminate a stale comment. It describes another use case for the pmap in 2012-09-28 05:30:59 +00:00
modules Add TRIM support. 2012-09-23 19:40:58 +00:00
net The drbr(9) API appeared to be so unclear, that most drivers in 2012-09-28 18:28:27 +00:00
net80211 Fix a crash bug introduced in the iterate node work recently done. 2012-09-16 22:45:00 +00:00
netatalk
netgraph Ensure that all cases that enqueue a netgraph item for delivery by a 2012-09-27 20:12:51 +00:00
netinet carp_send_ad() should never return without rescheduling next run. 2012-09-29 05:52:19 +00:00
netinet6 Merge the projects/pf/head branch, that was worked on for last six months, 2012-09-08 06:41:54 +00:00
netipsec Add missing break 2012-09-18 08:00:43 +00:00
netipx
netnatm
netncp Add characters mapping for codepages used in Germany. 2012-06-01 03:59:08 +00:00
netpfil Simplify and somewhat redesign interaction between pf_purge_thread() and 2012-09-28 20:43:03 +00:00
netsmb Change a duplicated check to clarify that we really want to set a 2012-07-10 21:02:59 +00:00
nfs - Typo fix 2012-08-16 19:22:34 +00:00
nfsclient Do not leave invalid pages in the object after the short read for a 2012-08-14 11:45:47 +00:00
nfsserver Fix the mis-handling of the VV_TEXT on the nullfs vnodes. 2012-09-28 11:25:02 +00:00
nlm Fix grammar. 2012-08-16 13:01:56 +00:00
ofed The drbr(9) API appeared to be so unclear, that most drivers in 2012-09-28 18:28:27 +00:00
opencrypto
pc98 MFi386: revision 237445 2012-09-23 09:13:57 +00:00
pci
powerpc Eliminate a stale comment. It describes another use case for the pmap in 2012-09-28 05:30:59 +00:00
rpc Complete revert of r239963: 2012-09-27 19:10:25 +00:00
security Check vplabel for NULL before dereferencing it. Fixes a panic 2012-05-03 15:51:34 +00:00
sparc64 Eliminate a stale comment. It describes another use case for the pmap in 2012-09-28 05:30:59 +00:00
sys The drbr(9) API appeared to be so unclear, that most drivers in 2012-09-28 18:28:27 +00:00
teken
tools
ufs Fix up kernel sources to be ready for a 64-bit ino_t. 2012-09-27 23:30:49 +00:00
vm Fix the mis-handling of the VV_TEXT on the nullfs vnodes. 2012-09-28 11:25:02 +00:00
x86 - Re-shuffle the <machine/pc/bios.h> headers to move all kernel-specific 2012-09-28 11:59:32 +00:00
xdr
xen
Makefile