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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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just move that into uvm_pagedeactivate.
oga@ ok
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shitz.
Code mostly from netbsd with some tweaks from me. The loaning case is
specifcically if 0ed out right now because we do not do loaning.
ok ariane@, art@.
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This commit won't change the default behaviour of the system unless the
buffer cache size is increased with sysctl kern.bufcachepercent. By default
our buffer cache is 10% of memory, which with this commit is now treated
as a low water mark. If the buffer cache size is increased, the new size
is treated as a high water mark and the buffer cache is permitted to grow
to that percentage of memory.
If the page daemon is invoked, the page daemon will ask the buffer cache
to relenquish pages. if the buffer cache has more than the low water mark it
will relenquish pages allowing them to be consumed by uvm. after a short
period the buffer cache will attempt to re-grow back to the high water mark.
This permits the use of a large buffer cache without penalizing the available
memory for other purposes.
Above the low water mark the buffer cache remains entirely subservient to
the page daemon, so if uvm requires pages, the buffer cache will abandon
them.
ok art@ thib@ oga@
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"that's retarded" art@.
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says were debugging leftovers.
ok ariane@
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one by tedu@. It doesn't do anything smart yet, it just uses
plain old disksort. we also keep the old method of queueing bufs
since some miods have crazy MD drivers that need some love.
ok beck@, art@
tested by many on many archs.
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global lock, switch the uvm object pages to being kept in a per-object
RB_TREE. Right now this is approximately the same speed, but cleaner.
When biglock usage is reduced this will improve concurrency due to lock
contention..
ok beck@ art@. Thanks to jasper for the speed testing.
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not encrypted.
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OK guenther@ otto@
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pgo_releasepg() hook and just free the page the "normal" way in the one
place we'll ever see PG_RELEASED and should care (uvm_page_unbusy,
called in aiodoned).
ok art@, beck@, thib@
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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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so we won't hit the kassert a little bit below it.
"obviously better than what is there now" beck@
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similar to the aobj.c changes, this one does vnodes. Vnodes are more
complex because they actaully have to sync to backing store. So firstly,
convert sync to sleep instead of setting released.
Now, for backing store, in the PGO_FREE case, if we set PG_RELEASED
*before* an async io, (nothing else will see it, the page is busy), then
we can ignore the page after the io is done. We could do something
similar for PGO_DEACTIVATE too, but that is another change. On error we
just clear the released flag, nothing else sets it for uobj pages other
than aiodoned.
ok thib@, beck@, ariane@
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ok thib@, weingart@.
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it is also not part of an aobj.
Clear anon flags at pagefree: page is no longer part of an anon.
ok oga
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Makes trace in ddb useful.
ok oga
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