1. 15 Dec, 2002 9 commits
    • Dominik Brodowski's avatar
      [PATCH] cpufreq: clean up CPU information · 8d13373b
      Dominik Brodowski authored
      This patch moves some basic per-CPU static information (minimum frequency,
      maximum frequency and maximum transition latency) into a struct
      cpufreq_cpuinfo. This offers a much cleaner struct cpufreq_driver and
      struct cpufreq_policy.
      8d13373b
    • Pavel Machek's avatar
      [PATCH] ACPI/S3: simplify assembly code a bit · 9aa5637c
      Pavel Machek authored
      Kill unused variable and simplify assembly portion a bit...
      9aa5637c
    • Pavel Machek's avatar
      [PATCH] ACPI/S3: fix gcc3.2 compatibility · c8dfe2bf
      Pavel Machek authored
      gcc3.2 is a bit more pedantic...
      c8dfe2bf
    • Richard Henderson's avatar
      [PATCH] sr_ioctl fix · de69d34e
      Richard Henderson authored
      sr_ioctl.c uses virt_to_phys, which is defined in asm/io.h.
      On x86, this accidentally works, due to other indirect includes,
      but on Alpha results in a link error.
      de69d34e
    • Ingo Molnar's avatar
      [PATCH] threaded coredumps, tcore-fixes-2.5.51-A0 · b9daa006
      Ingo Molnar authored
      This fixes one more threaded-coredumps detail reported by the glibc
      people: all threads taken down by the coredump code should report the
      proper exit code.  We can do this rather easily via the group_exit
      mechanism.  'Other' threads used to report SIGKILL, which was highly
      confusing as the shell often displayed the 'Killed' message instead of a
      'Segmentation fault' message.
      
      Another missing bit was the 0x80 bit set in the exit status for all
      threads, if the coredump was successful.  (it's safe to set this bit in
      ->sig->group_exit_code in an unlocked way because all threads are
      artificially descheduled by the coredump code.)
      b9daa006
    • Randy Dunlap's avatar
      [PATCH] move console_loglevel scalars to array (resend) · f3ce0064
      Randy Dunlap authored
      Moves console_loglevel & friends to an array, as sysctl expects.
      f3ce0064
    • Brian Gerst's avatar
      [PATCH] Remove Rules.make from Makefiles (3/3) · 0b319ed0
      Brian Gerst authored
      Makefiles no longer need to include Rules.make, which is currently an
      empty file.  This patch removes it from the remaining Makefiles, and
      removes the empty Rules.make file.
      0b319ed0
    • Brian Gerst's avatar
      [PATCH] Remove Rules.make from Makefiles (2/3) · b4499c72
      Brian Gerst authored
      Makefiles no longer need to include Rules.make, which is currently an
      empty file.  This patch removes it from the drivers tree Makefiles.
      b4499c72
    • Brian Gerst's avatar
      [PATCH] Remove Rules.make from Makefiles (1/3) · 1cec92af
      Brian Gerst authored
      Makefiles no longer need to include Rules.make, which is currently an
      empty file.  This patch removes it from the arch tree Makefiles.
      1cec92af
  2. 14 Dec, 2002 31 commits
    • Kai Mäkisara's avatar
      [PATCH] SCSI tape driver fixes for 2.5.51 · 226e3bda
      Kai Mäkisara authored
      This contains the following changes for the SCSI tape driver in 2.5.51:
      - fix module bugs that prevent finding any devices
      - allow opening a device with O_NONBLOCK | O_RDWR even if the tape in drive
        is write protected
      226e3bda
    • Andrew Morton's avatar
      [PATCH] remove vm_area_struct.vm_raend · 55478b6c
      Andrew Morton authored
      Remove the unused vm_area_struct.vm_raend.
      
      If someone wants to tune per-VMA readaround then they can alter
      vma->vm_file->f_ra.ra_pages.
      55478b6c
    • Andrew Morton's avatar
      [PATCH] ext3: fix error-path bh leak · 5e352342
      Andrew Morton authored
      It is missing a brelse() on an error path.
      5e352342
    • Andrew Morton's avatar
      [PATCH] Add prefetching to get_page_state() · 351419e2
      Andrew Morton authored
      Fetch the next cacheline as we're counting up the fields in this one.
      351419e2
    • Andrew Morton's avatar
      [PATCH] ext2 synchronous mount fix · 7cc9ee3d
      Andrew Morton authored
      The optimisation for synchronous mounts was only correct for S_ISREG
      files.  Directories do not pass through generic_osync_inode() and we
      still need to synchronously write out their indirect blocks.
      7cc9ee3d
    • Andrew Morton's avatar
      [PATCH] pad pte_chains out to a cacheline · c566bb56
      Andrew Morton authored
      In PAE mode there is a 4-byte gap and they're not aligning correctly.
      c566bb56
    • Andrew Morton's avatar
      [PATCH] Fix off-by-one in the page allocator · 90b3b976
      Andrew Morton authored
      From Hugh.
      
      Be consistent in deciding when we are below the zone allocation
      thresholds.
      90b3b976
    • Andrew Morton's avatar
      [PATCH] tidier atomic check in mempool_alloc() · 36aed1f9
      Andrew Morton authored
      From Hugh.
      
      Be more explicit in the "can we sleep" test.  It doesn't change
      anything unless someone is performing __GFP_IO && !__GFP_WAIT
      allocations, which is nonsensical.
      36aed1f9
    • Andrew Morton's avatar
      [PATCH] provide a default super_block_operations · b88f83d5
      Andrew Morton authored
      A little cleanup suggested by Chris Mason or Al Viro.
      
      Quite a number of codepaths are testing whether a superblock has a
      non-null ->s_op pointer.  We can remove all those by making sure that
      all superblocks have a valid ->s_op.
      b88f83d5
    • Andrew Morton's avatar
      [PATCH] madvise_willneed() maximum readahead checking · 654107b9
      Andrew Morton authored
      madvise_willneed() currently has a very strange check on how much readahead
      it is prepared to do.
      
        It is based on the user's rss limit.  But this is usually enormous, and
        the user isn't necessarily going to map all that memory at the same time
        anyway.
      
        And the logic is wrong - it is comparing rss (which is in bytes) with
        `end - start', which is in pages.
      
        And it returns -EIO on error, which is not mentioned in the Open Group
        spec and doesn't make sense.
      
      
      This patch takes it all out and applies the same upper limit as is used in
      sys_readahead() - half the inactive list.
      654107b9
    • Andrew Morton's avatar
      [PATCH] remove a vm debug check · d8259d09
      Andrew Morton authored
      This ad-hoc assertion is no longer true.  If all zones are in the `all
      unreclaimable' state it can trigger.  When testing with a tiny amount
      of physical memory.
      d8259d09
    • Andrew Morton's avatar
      [PATCH] limit pinned memory due to readahead · 234931ab
      Andrew Morton authored
      readahead allocates all the pages before starting I/O.  Potentially bad
      if someone is performing huge reads with madvise or sys_readahead().
      
      So the patch just busts that up into two-megabyte units.
      234931ab
    • Andrew Morton's avatar
      [PATCH] don't apply file size rlimits to blockdevs · 67de87c5
      Andrew Morton authored
      generic_file_write()'s rlimit checks are preventing writes to large
      offsets into blockdevs:
      
      # ulimit -f 10000
      # dd if=/dev/zero of=/dev/sde5 bs=1k count=1 seek=1000000
      zsh: file size limit exceeded
      
      So don't apply that check if it's a blockdev.
      
      The patch also caches the S_ISBLK result in a local.
      67de87c5
    • Andrew Morton's avatar
      [PATCH] ext2/ext3_free_blocks() extra check · db0d232c
      Andrew Morton authored
      From Andreas Dilger.
      
      Additional sanity checks in the ext2 and ext3 block allocators: if
      someone tries to free a negative number of blocks, detect and handle
      that rather than wrecking the fs.
      db0d232c
    • Andrew Morton's avatar
      [PATCH] bootmem allocator merging fix · 344391c7
      Andrew Morton authored
      Patch from "Juan M. de la Torre" <jmtorre@gmx.net>
      
      If the requested align is PAGE_SIZE, it is impossible to merge with the
      previous allocation request, because the allocated area must begin in a
      page boundary.
      344391c7
    • Andrew Morton's avatar
      [PATCH] Don't inherit mm->def_flags across forks · 4d840923
      Andrew Morton authored
      Prevents children from inheriting mlockall(MCL_FUTURE).
      Standards-friendly, and 2.4 has it.
      4d840923
    • Andrew Morton's avatar
      [PATCH] remove PF_SYNC · 577c516f
      Andrew Morton authored
      current->flags:PF_SYNC was a hack I added because I didn't want to
      change all ->writepage implementations.
      
      It's foul.  And it means that if someone happens to run direct page
      reclaim within the context of (say) sys_sync, the writepage invokations
      from the VM will be treated as "data integrity" operations, not "memory
      cleansing" operations, which would cause latency.
      
      So the patch removes PF_SYNC and adds an extra arg to a_ops->writepage.
       It is the `writeback_control' structure which contains the full context
      information about why writepage was called.
      
      The initial version of this patch just passed in a bare `int sync', but
      the XFS team need more info so they can perform writearound from within
      page reclaim.
      
      The patch also adds writeback_control.for_reclaim, so writepage
      implementations can inspect that to work out the call context rather
      than peeking at current->flags:PF_MEMALLOC.
      577c516f
    • Andrew Morton's avatar
      [PATCH] Reserve an additional transaction block in · 8725c3fc
      Andrew Morton authored
      Under rare conditions (filesystem corruption, really) it is possible
      for ext3_dirty_inode() to require _two_ blocks for the transaction: one
      for the inode and one to update the superblock - to set
      EXT3_FEATURE_RO_COMPAT_LARGE_FILE.  This causes the filesystem to go
      BUG.
      
      So reserve an additional block for that eventuality.
      8725c3fc
    • Andrew Morton's avatar
      [PATCH] Set a minimum hash table size for wait_on_page() · e4406863
      Andrew Morton authored
      Fixes the problem identified by Miles Bader on extremely small zones:
      calling hash_long with `bits = 0' is treated as `bits = 32'.
      
      So don't permit the zone to have a one-slot waitqueue hashtable.
      e4406863
    • Andrew Morton's avatar
      [PATCH] Add /proc/sys/vm/lower_zone_protection · c1859213
      Andrew Morton authored
      This allows us to control the aggressiveness of the lower-zone defense
      algorithm.  The `incremental min'.  For workloads which are using a
      serious amount of mlocked memory, a few megabytes is not enough.
      
      So the `lower_zone_protection' tunable allows the administrator to
      increase the amount of protection which lower zones receive against
      allocations which _could_ use higher zones.
      
      The default value of lower_zone_protection is zero, giving unchanged
      behaviour.  We should not normally make large amounts of memory
      unavailable for pagecache just in case someone mlocks many hundreds of
      megabytes.
      c1859213
    • Andrew Morton's avatar
      [PATCH] fs-writeback rework. · 20b96b52
      Andrew Morton authored
      I've revisited all the superblock->inode->page writeback paths.  There
      were several silly things in there, and things were not as clear as they
      could be.
      
      scenario 1: create and dirty a MAP_SHARED segment over a sparse file,
      then exit.
      
        All the memory turns into dirty pagecache, but the kupdate function
        only writes it out at a trickle - 4 megabytes every thirty seconds.
        We should sync it all within 30 seconds.
      
        What's happening is that when writeback tries to write those pages,
        the filesystem needs to instantiate new blocks for them (they're over
        holes).  The filesystem runs mark_inode_dirty() within the writeback
        function.
      
        This redirtying of the inode while we're writing it out triggers
        some livelock avoidance code in __sync_single_inode().  That function
        says "ah, someone redirtied the file while I was writing it.  Let's
        move the file to the new end of the superblock dirty list and write
        it out later." Problem is, writeback dirtied the inode itself.
      
        (It is rather silly that mark_inode_dirty() sets I_DIRTY_PAGES when
        clearly no pages have been dirtied.  Fixing that up would be a
        largish work, so work around it here).
      
        So this patch just removes the livelock avoidance from
        __sync_single_inode().  It is no longer needed anyway - writeback
        livelock is now avoided (in all writeback paths) by writing a finite
        number of pages.
      
      scenario 2: an application is continuously dirtying a 200 megabyte
      file, and your disk has a bandwidth of less than 40 megabytes/sec.
      
        What happens is that once 30 seconds passes, pdflush starts writing
        out the file.  And because that writeout will take more than five
        seconds (a `kupdate' interval), pdflush just keeps writing it out
        forever - continuous I/O.
      
        What we _want_ to happen is that the 200 megabytes gets written,
        and then IO stops for thirty seconds (minus the writeout period).  So
        the file is fully synced every thirty seconds.
      
      The patch solves this by using mapping->io_pages more intelligently.
      When the time comes to write the file out, move all the dirty pages
      onto io_pages.  That is a "batch of pages for this kupdate round".
      When io_pages is empty, we know we're done.
      
      The address_space_operations.writepages() API is changed!  It now only
      needs to write the pages which the caller placed on mapping->io_pages.
      
      This conceptually cleans things up a bit, by more clearly defining the
      role of ->io_pages, and the motion between the various mapping lists.
      
      The treatment of sb->s_dirty and sb->s_io is now conceptually identical
      to mapping->dirty_pages and mapping->io_pages: move the items-to-be
      written onto ->s_io/io_pages, alk walk that list.  As inodes (or pages)
      are written, move them over to the clean/locked/dirty lists.
      
      Oh, scenario 3: start an app whcih continuously overwrites a 5 meg
      file.  Wait five seconds, start another, wait 5 seconds, start another.
       What we _should_ see is three 5-meg writes, five seconds apart, every
      thirty seconds.  That did all sorts of odd things.  It now does the
      right thing.
      20b96b52
    • Andrew Morton's avatar
      [PATCH] hugetlb fixes · 21c2baef
      Andrew Morton authored
      From Rohit
      
      1) hugetlbfs_zero_setup returns ENOMEM in case the request size can
         not be easily handleed.
      
      2) Preference is given to LOW_MEM while freeing the pages from
         hugetlbpage free list.
      21c2baef
    • Andrew Morton's avatar
      [PATCH] vm accounting fixes and addition · c720c50a
      Andrew Morton authored
      - /proc/vmstat:pageoutrun and /proc/vmstat:allocstall are always
        identical.  Rework this so that
      
        - "allocstall" is the number of times a page allocator ran diect reclaim
      
        - "pageoutrun" is the number of times kswapd ran page reclaim
      
      - Add a new stat: "pgrotated".  The number of pages which were
        rotated to the tail of the LRU for immediate reclaim by
        rotate_reclaimable_page().
      
      - Document things a bit.
      c720c50a
    • Andrew Morton's avatar
      [PATCH] copy_user checks in filldir() · 54cbdcfd
      Andrew Morton authored
      Check for usercopy faults in filldir().
      54cbdcfd
    • Andrew Morton's avatar
      [PATCH] implement ext3_sync_fs · 012af46c
      Andrew Morton authored
      ext3_sync_fs will start a commit and will wait on that commit.  This
      means that on its return, all journalled file data has been dirtied and
      exposed to sync_inodes_sb().  Which is sufficient to fix the umount
      data loss problem.
      012af46c
    • Andrew Morton's avatar
      [PATCH] Add a sync_fs super_block operation · 75f19a40
      Andrew Morton authored
      This is infrastructure for fixing the journalled-data ext3 unmount data
      loss problem. It was sent for comment to linux-fsdevel a week ago; there
      was none.
      
      Add a `sync_fs' superblock operation whose mandate is to perform
      filesystem-specific operations to ensure a successful sync.
      
      It is called in two places:
      
      1: fsync_super() - for umount.
      
      2: sys_sync() - for global sync.
      
      In the sys_sync() case we call all the ->write_super() methods first.
      write_super() is an async flushing operation.  It should not block.
      
      After that, we call all the ->sync_fs functions.  This is independent
      of the state of s_dirt!  That was all confused up before, and in this
      patch ->write_super() and ->sync_fs() are quite separate.
      
      With ext3 as an example, the initial ->write_super() will start a
      transaction, but will not wait on it.  (But only if s_dirt was set!)
      
      The first ->sync_fs() call will get the IO underway.
      
      The second ->sync_fs() call will wait on the IO.
      
      And we really do need to be this elaborate, because all the testing of
      s_dirt in there makes ->write_super() an unreliable way of detecting
      when the VFS is trying to sync the filesystem.
      75f19a40
    • Andrew Morton's avatar
      [PATCH] handle overflows in radix_tree_gang_lookup() · 7404e32c
      Andrew Morton authored
      Fix a radix-tree bug spotted by Vladimir Saveliev <vs@namesys.com>.
      
      Each step in the radix tree spans six address bits.  So a height=6 tree
      spans 36-bits worth of nodes.
      
      On 32-bit machines radix_tree_gang_lookup() doesn't handle this right -
      at the 12TB mark it wraps back to zero, and returns pages at quite
      wrong indices.
      
      The patch fixes all that up, and tidies a couple of things.
      
      A user-space test harness was developed so that the code can be sanely
      tested.  It is at
      
      	http://www.zip.com.au/~akpm/linux/patches/stuff/rtth.tar.gz
      7404e32c
    • Andrew Morton's avatar
      [PATCH] make sure all PMDs are allocated under PAE mode · 2134c937
      Andrew Morton authored
      Patch from Martin Bligh and Dave Hansen
      
      If a PAE machine has 1G of memory and you set PAGE_OFFSET to 2G, the
      kernel will only instantiate a PMD to cover the 2G-3G region.  But
      another PMD is needed for the 3G-4G region for the APIC and possibly an
      extended vmalloc region.
      
      So the patch changes the code to instantiate PMDs out to the end of
      physical memory.
      
      It's a no-op for PAGE_OFFSET=3G, and _could_ be part of the
      CONFIG_PAGE_OFFSET patch.  But it seems a reasonable generalisation
      anyway.
      2134c937
    • Andrew Morton's avatar
      [PATCH] show_free_areas extensions · b7fdef78
      Andrew Morton authored
      Ancient patch From Bill Irwin
      
      The patch is intended to show improved information about where the
      memory went during OOM-killing events.
      
      - when the OOM killer fails and the system panics, calls
        show_free_areas()
      
      - reorganize show_free_areas() to use for_each_zone()
      
      - add per-cpu stats to show_free_areas()
      
      - tags output from show_free_areas() with node and zone information
      b7fdef78
    • Andrew Morton's avatar
      [PATCH] Remove fail_writepage, redux · 3e9afe4c
      Andrew Morton authored
      fail_writepage() does not work.  Its activate_page() call cannot
      activate the page because it is not on the LRU.
      
      So perform that function (more efficiently) in the VM.  Remove
      fail_writepage() and, if the filesystem does not implement
      ->writepage() then activate the page from shrink_list().
      
      A special case is tmpfs, which does have a writepage, but which
      sometimes wants to activate the pages anyway.  The most important case
      is when there is no swap online and we don't want to keep all those
      pages on the inactive list.  So just as a tmpfs special-case, allow
      writepage() to return WRITEPAGE_ACTIVATE, and handle that in the VM.
      
      Also, the whole idea of allowing ->writepage() to return -EAGAIN, and
      handling that in the caller has been reverted.  If a writepage()
      implementation wants to back out and not write the page, it must
      redirty the page, unlock it and return zero.  (This is Hugh's preferred
      way).
      
      And remove the now-unneeded shmem_writepages() - shmem inodes are
      marked as `memory backed' so it will not be called.
      
      And remove the test for non-null ->writepage() in generic_file_mmap().
      Memory-backed files _are_ mmappable, and they do not have a
      writepage().  It just isn't called.
      
      So the locking rules for writepage() are unchanged.  They are:
      
      - Called with the page locked
      - Returns with the page unlocked
      - Must redirty the page itself if it wasn't all written.
      
      But there is a new, special, hidden, undocumented, secret hack for
      tmpfs: writepage may return WRITEPAGE_ACTIVATE to tell the VM to move
      the page to the active list.  The page must be kept locked in this one
      case.
      3e9afe4c
    • Andrew Morton's avatar
      [PATCH] skip memory-backed filesystems in writeback · 660282aa
      Andrew Morton authored
      There's nopoint in walking through a lot of tmpfs or ramdisk pages when
      we're trying to clean memory.  So if a memory-backed inode is
      discovered during writeback, skip the entire superblock.
      660282aa