1. Clustered I/O is switched by the MNT_NOCLUSTERR and MNT_NOCLUSTERW
bits of the mnt_flag. The sysctl variables, vfs.foo.doclusterread
and vfs.foo.doclusterwrite are deleted. Only mount option can
control clustered I/O from userland.
2. When foofs_mount mounts block device, foofs_mount checks D_CLUSTERR
and D_CLUSTERW bits of the d_flags member in the block device switch
table. If D_NOCLUSTERR / D_NOCLUSTERW are set, MNT_NOCLUSTERR /
MNT_NOCLUSTERW bits will be set. In this case, MNT_NOCLUSTERR and
MNT_NOCLUSTERW cannot be cleared from userland.
3. Vnode driver disables both clustered read and write.
4. Union filesystem disables clutered write.
Reviewed by: bde
- some addition of comments (for readability)
- iso-2022 G0 designation support. This does almost nothing. Just for
avoiding garbled screen when got "ESC ( B".
(how about G1/2/3 designation? I'm not sure)
(usually a couple of thousand) to 25. The measured impact on cache-hits
doesn't justify spending memory this way:
Target number of free vnodes versus namecache hit rate in % during a
make world:
10 98.5316
200 98.5479
500 98.5546
1000 98.5709
3000 98.6006
4000 98.6126
report slightly more than 64MB of total memory. This can happen due to the
total being the sum of both base and extended memory.
Submitted by: Alan Cox <alc@cs.rice.edu>
hash chain traversal isn't needed. This also allows untimeout to recompute
the hash to find the bucket that the entry to remove is stored in so
that each callout entry no longer needs to store that information.
Reviewed by: Nate Williams <nate@mt.sri.com>
buffer queue so I missed this when I changed buf_queue_head.
This probably fixes Soren's problem too, but he never mentioned
which CD driver he was using. 8-)
Submitted by: dave adkins <adkin003@tc.umn.edu>
Change the definition of a buffer queue so that bufqdisksort can
properly deal with bordered writes.
Add inline functions for accessing buffer queues. This should be
considered an opaque data structure by clients.
callout.h:
New callout implementation.
device.h:
Add support for CAM interrupts.
disk.h:
disklabel.h:
tqdisksort->bufqdisksort
kernel.h:
Add new configuration entries for configuration hooks and calling
cpu_rootconf and cpu_dumpconf.
param.h:
Add a priority for sleeping waiting on config hooks.
proc.h:
Update for new callout implementation.
queue.h:
Add TAILQ_HEAD_INITIALIZER from NetBSD.
systm.h:
Add prototypes for cpu_root/dumpconf, splcam, splsoftcam, etc..
Add support for "interrupt driven configuration hooks".
A component of the kernel can register a hook, most likely
during auto-configuration, and receive a callback once
interrupt services are available. This callback will occur before
the root and dump devices are configured, so the configuration
task can affect the selection of those two devices or complete
any tasks that need to be performed prior to launching init.
System boot is posponed so long as a hook is registered. The
hook owner is responsible for removing the hook once their task
is complete or the system boot can continue.
kern_acct.c kern_clock.c kern_exit.c kern_synch.c kern_time.c:
Change the interface and implementation for the kernel callout
service. The new implemntaion is based on the work of
Adam M. Costello and George Varghese, published in a technical
report entitled "Redesigning the BSD Callout and Timer Facilities".
The interface used in FreeBSD is a little different than the one
outlined in the paper. The new function prototypes are:
struct callout_handle timeout(void (*func)(void *),
void *arg, int ticks);
void untimeout(void (*func)(void *), void *arg,
struct callout_handle handle);
If a client wishes to remove a timeout, it must store the
callout_handle returned by timeout and pass it to untimeout.
The new implementation gives 0(1) insert and removal of callouts
making this interface scale well even for applications that
keep 100s of callouts outstanding.
See the updated timeout.9 man page for more details.
Add cpu_rootconf and cpu_dumpconf so that configuring these
two devices can be better controlled by the MI configuration
code.
machdep.c:
MD initialization code for the new callout interface.
trap.c:
Add support for printing out whether cam interrupts are masked
during a panic.
