in genfs_do_putpages() and uao_put().
Use 'v_uobj.uo_npages' to check for an empty memq.
Put some assertions where these marker pages may not appear.
Ok: YAMAMOTO Takashi <yamt@netbsd.org>
Add MI flags PMAP_WRITE_COMBINE, PMAP_WRITE_BACK, PMAP_NOCACHE_OVR.
Update pmap(9) manpage.
hppa: Remove MD PMAP_NOCACHE flag as it exists as MI flag
mips: Rename MD PMAP_NOCACHE to PGC_NOCACHE.
x86: Implement new MI flags using Page-Attribute Tables.
x86: Implement BUS_SPACE_MAP_PREFETCHABLE.
Patch presented on tech-kern@:
http://mail-index.netbsd.org/tech-kern/2010/06/30/msg008458.html
No comments on this last version.
Forgot to commit this in previous.
in ubc_fault(), rework logic to "remember" the last object of page and
reduce locking overhead, since in common case pages belong to one and
the same UVM object (but not always, therefore add a comment).
Unlocks before pmap_update(), on removal of mappings, might cause TLB
coherency issues, since on architectures like x86 and mips64 invalidation
IPIs are deferred to pmap_update(). Hence, VA space might be globally
visible before IPIs are sent or while they are still in-flight.
OK ad@.
problems with large mappings. i've seen my system hang for a total
of 45 seconds when radeondrm is opened by X11, and it is the checks
in this function that take so long.
through all LWPs and duplicate locking overhead.
- Move sched_pstats() from soft-interrupt context to process 0 main loop.
Avoids blocking effect on real-time threads. Mostly fixes PR/38792.
Note: it might be worth to move the loop above PRI_PGDAEMON. Also,
sched_pstats() might be cleaned-up slightly.
to the total free memory available to the system, use the smallest value
between VM_MAXUSER_ADDRESS and total free memory (having a RSS limit
bigger than VM_MAXUSER_ADDRESS has no real meaning).
Fix a possible int overflow when ptoa(uvmexp.free) is bigger than 4GB
with a 32 bits vaddr_t.
Reviewed by bouyer@.
See also http://mail-index.netbsd.org/tech-kern/2010/02/24/msg007395.html
pmap_update() without calling pmap_enter().
(Probably calling only once after loop (as done in uvm_fault_lower_lookup())
is enough. If done so, other threads see entered neighbor pages as reflected
a little latter.)
numbers. Using ptoa() will cast to vaddr_t, which might no be adequate
for architectures where sizeof(paddr_t) > sizeof(vaddr_t) (like i386 PAE).
- small fix inside AGP heuristics to avoid masking high order bits for
systems with more than 4GB.
Reviewed by bouyer@.
See also http://mail-index.netbsd.org/tech-kern/2010/02/22/msg007373.html
This blocks an easy exploit of kernel bugs leading to dereference
of a NULL pointer on some architectures (eg i386).
The check can be disabled in various ways:
-by CPP definitions in machine/types.h (portmaster's choice)
-by a kernel config option USER_VA0_DISABLED_DEFAULT=0
-at runtime by sysctl vm.user_va0_disabled (cannot be cleared
at securelevel>0)
on the amount of physical memory and limited by NMBCLUSTERS if present.
Architectures without direct mapping also limit it based on the kmem_map
size, which is used as backing store. On i386 and ARM, the maximum KVA
used for mbuf clusters is limited to 64MB by default.
The old default limits and limits based on GATEWAY have been removed.
key_registered_sb_max is hard-wired to a value derived from 2048
clusters.
refers to another "uobj" used to call pgo_get. Revert the wrong assertion
I made. My bad.
(This and pgo_get's possible ERESTART return value check is the only 2 behavioral
changes I made.)
Reported by drochner@, thanks.
