mutex profiling code. As with existing mutex profiling, measurement
is done with respect to mtx_lock() instances in the code, as opposed
to specific mutexes. In particular, measure two things:
(1) Lock contention. How often did this mtx_lock() call get made and
have to sleep (or almost sleep) waiting for the lock. This helps
identify the "victims" of contention.
(2) Hold contention. How often, while the lock was held by a thread
as a result of this mtx_lock(), did another thread try to acquire
the same mutex. This helps identify the causes of contention.
I'm currently exploring adding measurement of "time waited for the
lock", but the current implementation has proven useful to me so far
so I figured I'd commit it so others could try it out. Note that this
increases the size of mutexes when MUTEX_PROFILING is enabled, so you
might find you need to further bump UMA_BOOT_PAGES. Fixes welcome.
The once over: des, others
one which runs the actual update. This fixes a bug where there were
a delay in applying the frequency adjustment. In extreme cases this
could result in marginal stability of the kernel-pll.
full state. (When swap is added their state will change appropriately.)
2. Set swap_pager_full and swap_pager_almost_full to the full state when
the last swap device is removed.
Combined these changes eliminate nonsense messages from the kernel on swap-
less machines.
Item 2 submitted by: Divacky Roman <xdivac02@stud.fit.vutbr.cz>
Prodding by: phk
For some very unclear reason this device contains a FTDI 8U232AM USB->COM
adapter, but reports different device id than original 8U232AM. At the same
time, it reports vendor id of FTDI.
Sponsored by: Porta Software Ltd
MFC after: 2 weeks
Suggested by: nate
- get rid of "magick" values in code and make sysctl's reflecting reality
on processor versions which have one or another frequency "forbidden"
due to errata.
MFC after: 2 weeks
Suggested by: nate
- get rid of "magick" values in code and make sysctl's reflecting reality
on processor versions which have one or another frequency "forbidden"
due to errata.
PR:
Submitted by:
Reviewed by:
Approved by:
Obtained from:
MFC after: 2 weeks
the user requests a read-only mount. This is necessary because we
don't do the VOP_OPEN again if they upgrade a read-only mount to
read-write.
Noticed by: bde
their lines.
Properly discard PCMCIA device declarations. I plan to support
PCMCIA cards, but they don't work yet, and it appears some .INF files
declare both PCI and PCMCIA device instances.
The uidinfo code appears to be MPSAFE, and is referenced without Giant
elsewhere. While this grab of Giant was only made in fairly rare
circumstances (actually GC'ing on refcount==0), grabbing Giant here
potentially introduces lock order issues with any locks held by the
caller. So this probably won't help performance much unless you change
credentials a lot in an application, and leave a lot of file descriptors
and cached credentials around. However, it simplifies locking down
consumers of the credential interfaces.
Bumped into by: sam
Appeased: tjr
to a new prison_complete() task run by a task queue. This removes
a requirement for grabbing Giant in crfree(). Embed the 'struct task'
in 'struct prison' so that we don't have to allocate memory from
prison_free() (which means we also defer the FREE()).
With this change, I believe grabbing Giant from crfree() can now be
removed, but need to check the uidinfo code paths.
To avoid header pollution, move the definition of 'struct task'
to _task.h, and recursively include from taskqueue.h and jail.h; much
preferably to all files including jail.h picking up a requirement to
include taskqueue.h.
Bumped into by: sam
Reviewed by: bde, tjr
