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with a spinlock (even vslocked() buffers may fault in the right
(complicated) situation).
We solve this by preallocating a bounded array for the response and copying the
data out when all locks have been released.
ok thib@, beck@
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gets rid of #include <sys/dkio.h> in sys/ioctl.h and adds #include
<sys/dkio.h> to the places that actually want and use the disk
ioctls.
this became an issue when krw@'s X build failed when he was testing
a change to dkio.h.
tested by krw@
help from and ok miod@
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I forgot that uvm_object.c wasn't build if SMALL_KERNEL. Fix this by building
the file unconditionally and only building the less used functions when
SMALL_KERNEL is not defined.
unbreaks ramdisk build. ok jsg@
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places in the tree need to be touched to update the object
initialisation with respect to that.
So, make a function (uvm_initobj) that takes the refcount, object and
pager ops and does this initialisation for us. This should save on
maintainance in the future.
looked good to fgs@. Tedu complained about the British spelling but OKed
it anyway.
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If when we have successfully swapped an aobj back in, then we release our
reference count, and that reference is the last reference, we will free the
the aobj and recursively lock the list lock.
Fix this by keeping track of the last object we had a reference on, and
releasing the refcount the next time we unlock the list lock.
Put a couple of comments in explaining lock ordering in this file.
noticed by, discussed with and ok guenther@.
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where there is almost nothing left to them, so that we can continue getting
rid of them
ok oga
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most importantly swapoff) over to a mutex. No idea how many times i've
written this diff in the past.
ok deraadt@
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ok oga
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no functional change. from Anton Maksimenkov
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recommit pmemrange:
physmem allocator: change the view of free memory from single
free pages 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.
Useable now that bugs have been found and fixed in most architecture's
pmap.c
ok by everyone who has done a pmap or uvm commit in the last year.
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(because it pulls in so much of the world) so include it for now, but
mark it XXX
ok tedu
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sysctl.h was reliant on this particular include, and many drivers included
sysctl.h unnecessarily. remove sysctl.h or add proc.h as needed.
ok deraadt
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ok kettenis@ beck@ (tentatively) and ariane@. deraadt asked for it to be
commited now.
original commit message:
extend uvm_page_physload to have the ability to add "device" pages to
the 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@, beck@
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for use by the uvm pseg code. this is the path of least resistance until
we sort out how many of these functions we really need. problem found by mikeb
ok kettenis oga
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re-add uvm_objwire and uvm_objunwire.
"you may commit that" kettenis@
original diff oked by ariane@ and art@
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It was backed out as part of the date-based revert after c2k9.
"you can commit that" kettenis@
original diff oked by ariane@, art@.
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base of data; with nicm@ ok miod@ guenther@
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more correctly reflect the new state of the world - that is - how many pages
can be cheaply reclaimed - which now includes clean buffer cache pages.
This change fixes situations where people would be running with a large bufcachepercent, and still notice swapping without the buffer cache backing off.
ok oga@, testing by many on tech@ and others. Thanks.
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- fixes ps(1)
- fixes kva deadbeef entries
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ok ariane@
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This is the same diff that was backed out after c2k9 in the date-based
revert.
ok ariane@
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Debugging aid, hiding in "option KVA_GUARDPAGES" in config.
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the kernel to reuse freed pages as quickly as possible, and it has been
finding bugs (some of which we have already fixed)
ok kettenis
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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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where we are below the inactive page target. This fixes a problem with a large
buffer cache on low memory machines where the the page daemon would woken up,
however the buffer cache would never be backed off because we were below the
inactive page target, which could result in constant paging and basically
a livelock condition.
ok oga@ art@
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Now instead of the global object hashtable, we have a per object tree.
Testing shows no performance difference and a slight code shrink. OTOH when
locking is more fine grained this should be faster due to lock contention on
uvm.hashlock.
ok thib@, art@.
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after c2k9
allows buffer cache to be extended and grow/shrink dynamically
tested by many, ok oga@, "why not just commit it" deraadt@
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fixed, but now it is time for a little break from the chaos.
ok kettenis
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whether removing holes or parts of them is allowed or not.
Only allow hole removal in uvmspace_free(), when tearing the vmspace down.
ok art@
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cache locality and will pave the way for the new pmemrange allocator.
Based on hints from art@ and ariane@.
ok ariane@, deraadt@, oga@
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This has has been tested very very thoroughly on all archs we have
excepting 88k and 68k. Please see cvs log for the individual commit
messages.
ok beck@, thib@
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which is exactly what the macro does.
Macro's that are nothing more then:
#define FUNCTION(arg) function(arg)
are almost always pointless and should go away.
OK blambert@
Agreed by many.
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specifically, if we free a RELEASED anon, then we will first of all
remove the page from the anon, free the anon, then get the next page
relative to the anon page, then call uvm_pagefree().
The problem is that while we zero out anon->an_page, we do not zero out
pg->uanon. Now, uvm_pagefree() if pg->uanon is not NULL zeroes out some
variables in the struct for us. One of the backed out commits added more
zeroing there which would have exacerbated this use after free under
heavy paging (which was where we saw bugs). Fix this by zeroing out
pg->uanon.
I have looked for other similar cases, but have not found any as of yet.
been in snaps a while, "please do commit that" deraadt@
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big uvm backout mess.
ok miod@
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More backouts in line with previous ones, this appears to bring us back to a
stable condition.
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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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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This is for the same reason as the earlier backouts, to avoid the bug
either added or exposed sometime around c2k9. This *should* be the last
one.
prompted by deraadt@
ok ariane@
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allocator).
"i can't see any obvious problems" oga
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separately).
a change at or just before the hackathon has either exposed or added a
very very nasty memory corruption bug that is giving us hell right now.
So in the interest of kernel stability these diffs are being backed out
until such a time as that corruption bug has been found and squashed,
then the ones that are proven good may slowly return.
a quick hitlist of the main commits this backs out:
mine:
uvm_objwire
the lock change in uvm_swap.c
using trees for uvm objects instead of the hash
removing the pgo_releasepg callback.
art@'s:
putting pmap_page_protect(VM_PROT_NONE) in uvm_pagedeactivate() since
all callers called that just prior anyway.
ok beck@, ariane@.
prompted by deraadt@.
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three
commits:
1) The sysctl allowing bufcachepercent to be changed at boot time.
2) The change moving the buffer cache hash chains to a red-black tree
3) The dynamic buffer cache (Which depended on the earlier too).
ok on the backout from marco and todd
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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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utter failure of process.
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Also de-inline functions.
This diff is intended to ease debugging. Once the current bug is fixed,
proper inlining will be redone.
ok: oga
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to function properly in the fast-allocation path (should not have triggered).
ok: oga, deraadt
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ass-backwards.
afaik this was found by the LLVM CLang static analyser.
ok ariane@ a couple of days ago.
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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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media just a wee bit too much.
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