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inline the loop in the one place it exists, and remove it from uvm
adjust a comment mentioning it accordingly
originally inspired by a diff fixing a comment from oga@
ok art@ beck@ miod@ oga@
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We still have no idea why this stops the crashes. but it does.
a machine forced to 64mb of ram cycled 10GB through swap with this diff
and is still running as I type this. Other tests by ariane@ and thib@
also seem to show that it's alright.
ok deraadt@, thib@, ariane@
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allocator).
"i can't see any obvious problems" oga
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> extend uvm_page_physload to have the ability to add "device" pages to the
> system.
since it was overlayed over a system that we warned would go "in to be
tested, but may be pulled out". oga, you just made me spend 20 minutes
of time I should not have had to spend doing this.
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system.
This is needed in the case where you need managed pages so you can
handle faulting and pmap_page_protect() on said pages when you manage
memory in such regions (i'm looking at you, graphics cards).
these pages are flagged PG_DEV, and shall never be on the freelists,
assert this. behaviour remains unchanged in the non-device case,
specifically for all archs currently in the tree we panic if called
after bootstrap.
ok art@, kettenis@, ariane@, beck@.
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to free ranges.
Classify memory based on region with associated use-counter (which is used
to construct a priority list of where to allocate memory).
Based on code from tedu@, help from many.
Ok art@
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pages.
"go for it" miod@
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For the possibility of sleeping, the first two flags are UVM_PLA_WAITOK
and UVM_PLA_NOWAIT. It is an error not to show intention, so assert that
one of the two is provided. Switch over every caller in the tree to
using the appropriate flag.
ok art@, ariane@
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NetBSD.
ok kurt@, drahn@, miod@
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now and valid for __HAVE_PMAP_DIRECT archs only, though implements
both code paths.
Put it's code directly into the uvm_km_getpage for PMAP_DIRECT archs.
No functional change.
ok tedu, art
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add a new arg to the backend so it can tell pool to slow down. when we get
this flag, yield *after* putting the page in the pool's free list. whatever
we do, don't let the thread sleep.
this makes things better by still letting the thread run when a huge pf
request comes in, but without artificially increasing pressure on the backend
by eating pages without feeding them forward.
ok deraadt
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a new etype, UVM_ET_HOLE, meaning it has no backend.
UVM_ET_HOLE entries (which should be created as UVM_PROT_NONE and with
UVM_FLAG_NOMERGE and UVM_FLAG_HOLE) are skipped in uvm_unmap_remove(), so
that pmap_{k,}remove() is not called on the entry.
This is intended to save time, and behave better, on pmaps with MMU holes
at process exit time.
ok art@, kettenis@ provided feedback as well.
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the holes a MMU may have from a given vm_map. This will be automagically
invoked for newly created vmspaces.
On platforms with MMU holes (e.g. sun4, sun4c and vax), this prevents
mmap(2) hints which would end up being in the hole to be accepted as valid,
causing unexpected signals when the process tries to access the hole
(since pmap can not fill the hole anyway).
Unfortunately, the logic mmap() uses to pick a valid address for anonymous
mappings needs work, as it will only try to find an address higher than the
hint, which causes all mmap() with a hint in the hole to fail on vax. This
will be improved later.
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in 15 years, make it a void function.
ok art@
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kmem_object) just so that we can remove them, just use pmap_extract
to get the pages to free and simplify a lot of code to not deal with
the list of intrsafe maps, intrsafe objects, etc.
miod@ ok
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for cpu_swapin() on hppa* which is kept).
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should never be referenced outside the context of the process to which
this stack belongs unless we do the PHOLD/PRELE dance. Loads of code
doesn't follow the rules here. Instead of trying to track down all
offenders and fix this hairy situation, it makes much more sense
to not swap kernel stacks.
From art@, tested by many some time ago.
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pass zero; this will be used shortly. From art@
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the protection of the memory mapping we're doing I/O on, or if we want to
leave them as they are. This should only be necessary for breakpoint
insertion in code, so we'll only use it for ptrace requests.
Initially from art@ after discussion with kettenis@ millert@ and I,
tested by many.
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the uvm_km_page allocator and use it instead of calling panic()
- add a counter to uvmexp so we can keep track of how many map entries
we have in use
idea from tedu@, long ago, okay deraadt@
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arches; except on sparc where the range is 4-8 for !sun4m and 4-64 for sun4m,
selected at runtime.
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pages a process uses. this is now the userland "data size" value.
ok art deraadt tdeval. thanks testers.
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scenarios, instead generating an ENOMEM backfeed, ok tedu@, prodded by many
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change both the nointr and default pool allocators to using uvm_km_getpage.
change pools to default to a maxpages value of 8, so they hoard less memory.
change mbuf pools to use default pool allocator.
pools are now more efficient, use less of kmem_map, and a bit faster.
tested mcbride, deraadt, pedro, drahn, miod to work everywhere
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an interrupt safe thread.
use this as the new backend for mbpool and mclpool, eliminating the mb_map.
introduce a sysctl kern.maxclusters which controls the limit of clusters
allocated.
testing by many people, works everywhere but m68k. ok deraadt@
this essentially deprecates the NMBCLUSTERS option, don't use it.
this should reduce pressure on the kmem_map and the uvm reserve of static
map entries.
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eventually not used anymore. Conforming to art@'s evil plans.
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rescinded 22 July 1999. Proofed by myself and Theo.
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ok art@
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ok art@, miod@
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uvm_unmap, uvm_deallocate and a few other functions.
Simplifies some code and reduces diff to the UBC branch.
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map_findspace is still broken on alpha. this will make debugging easier.
okay millert@
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the tree triggers the bug, PMAP_PREFER case was broken also.
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tree to find free space between entries. speeds up memory allocation,
etc...
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machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.
We apologise for the inconvenience.
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Today we add a pmap argument to pmap_update() and allocate map entries for
kernel_map from kmem_map instead of using the static entries. This should
get rid of MAX_KMAPENT panics. Also some uvm_loan problems are fixed.
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been converted to bus_dma ages ago, but since noone haven't bothered to do that
I haven't bothered to do more than to test that the kernel still builds
with those changes.
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Contains also support for page coloring.
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This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.
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code is written mostly by Chuck Silvers <chuq@chuq.com>/<chs@netbsd.org>.
Tested for the past few weeks by many developers, should be in a pretty stable
state, but will require optimizations and additional cleanups.
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