Hi Ted,
in the last few weeks quite a few of the bugs listed on your
(excellent) http://linux24.sourceforge.net/ have been fixed.
Here is a list of the VM bugs that are on your list and can
be moved to the "fixed" category:
* truncate->invalidate_inode_pages removes mapping information from
mapped pages which may be dirty; sync_pte -> crash. (CRITICAL)
fixed by Linus and Al
* VM: raw I/O data loss (raw IO may arrive in a page which afer it
is unammped from a process) (CRITICAL)
fixed by Linus, now page_launder() does the IO
and try_to_swap_out() only unmaps the pte
* VM: Fix the highmem deadlock, where the swapper cannot create low
memory bounce buffers OR swap out low memory because it has
consumed all resources {CRITICAL}
this was never an issue, the pagecache has been
highmem safe for a long time and the whole bounce
buffer creation has been removed
* VM: page->mapping->flush() callback in page_lauder() for easier
integration with journaling filesystem and maybe the network
filesystems
page->mapping->writepage(), used from page_launder()
... now ext3, reiserfs, xfs and others need to make
their own ->writepage() function
... some semantics are still being discussed, but it's
mostly ready
* VM: maybe rebalance the swapper a bit... we do page aging now so
maybe refill_inactive_scan() / shm_swap() and swap_out() need to
be rebalanced a bit
moving shm into the page cache permanently and doing
the page down aging from refill_inactive_scan() seems
to have fixed most of this
... low priority, but may still have some room for
improvement (consider it fixed)
The following bugs _could_ be fixed ... I'm not 100% certain
but they're probably gone (could somebody confirm/deny?):
* mm->rss is modified in some places without holding the
page_table_lock
* VFS?VM - mmap/write deadlock (demo code seems to show lock
is there)
The "probably post 2.4" category VM issues remain ... maybe
we want to add the following 2 items though:
* VM: experiment with different forms of page aging ... maybe
different aging rates for pages of different ages
* VM: RSS ulimit enforcement (trivial)
regards,
Rik
-- Virtual memory is like a game you can't win; However, without VM there's truly nothing to loose...http://www.surriel.com/ http://www.conectiva.com/ http://distro.conectiva.com.br/
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This archive was generated by hypermail 2b29 : Sun Jan 07 2001 - 21:00:22 EST