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  1. 16 9月, 2009 11 次提交
    • A
      HWPOISON: Define a new error_remove_page address space op for async truncation · 25718736
      由 Andi Kleen 提交于 
      Truncating metadata pages is not safe right now before
we haven't audited all file systems.

To enable truncation only for data address space define
a new address_space callback error_remove_page.

This is used for memory_failure.c memory error handling.

This can be then set to truncate_inode_page()

This patch just defines the new operation and adds documentation.

Callers and users come in followon patches.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      25718736
    • W
      HWPOISON: Add invalidate_inode_page · 83f78668
      由 Wu Fengguang 提交于 
      Add a simple way to invalidate a single page
This is just a refactoring of the truncate.c code.
Originally from Fengguang, modified by Andi Kleen.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      83f78668
    • N
      HWPOISON: Refactor truncate to allow direct truncating of page v2 · 750b4987
      由 Nick Piggin 提交于 
      Extract out truncate_inode_page() out of the truncate path so that
it can be used by memory-failure.c

[AK: description, headers, fix typos]
v2: Some white space changes from Fengguang Wu
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      750b4987
    • A
      HWPOISON: Handle hardware poisoned pages in try_to_unmap · 888b9f7c
      由 Andi Kleen 提交于 
      When a page has the poison bit set replace the PTE with a poison entry.
This causes the right error handling to be done later when a process runs
into it.

v2: add a new flag to not do that (needed for the memory-failure handler
later) (Fengguang)
v3: remove unnecessary is_migration_entry() test (Fengguang, Minchan)
Reviewed-by: NMinchan Kim <minchan.kim@gmail.com>
Reviewed-by: NWu Fengguang <fengguang.wu@intel.com>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      888b9f7c
    • A
      HWPOISON: Use bitmask/action code for try_to_unmap behaviour · 14fa31b8
      由 Andi Kleen 提交于 
      try_to_unmap currently has multiple modi (migration, munlock, normal unmap)
which are selected by magic flag variables. The logic is not very straight
forward, because each of these flag change multiple behaviours (e.g.
migration turns off aging, not only sets up migration ptes etc.)
Also the different flags interact in magic ways.

A later patch in this series adds another mode to try_to_unmap, so
this becomes quickly unmanageable.

Replace the different flags with a action code (migration, munlock, munmap)
and some additional flags as modifiers (ignore mlock, ignore aging).
This makes the logic more straight forward and allows easier extension
to new behaviours. Change all the caller to declare what they want to
do.

This patch is supposed to be a nop in behaviour. If anyone can prove
it is not that would be a bug.

Cc: Lee.Schermerhorn@hp.com
Cc: npiggin@suse.de
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      14fa31b8
    • A
      HWPOISON: Add basic support for poisoned pages in fault handler v3 · d1737fdb
      由 Andi Kleen 提交于 
      - Add a new VM_FAULT_HWPOISON error code to handle_mm_fault. Right now
architectures have to explicitely enable poison page support, so
this is forward compatible to all architectures. They only need
to add it when they enable poison page support.
- Add poison page handling in swap in fault code

v2: Add missing delayacct_clear_flag (Hidehiro Kawai)
v3: Really use delayacct_clear_flag (Hidehiro Kawai)
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      d1737fdb
    • A
      HWPOISON: Add new SIGBUS error codes for hardware poison signals · ad5fa913
      由 Andi Kleen 提交于 
      Add new SIGBUS codes for reporting machine checks as signals. When
the hardware detects an uncorrected ECC error it can trigger these
signals.

This is needed for telling KVM's qemu about machine checks that happen to
guests, so that it can inject them, but might be also useful for other programs.
I find it useful in my test programs.

This patch merely defines the new types.

- Define two new si_codes for SIGBUS.  BUS_MCEERR_AO and BUS_MCEERR_AR
* BUS_MCEERR_AO is for "Action Optional" machine checks, which means that some
corruption has been detected in the background, but nothing has been consumed
so far. The program can ignore those if it wants (but most programs would
already get killed)
* BUS_MCEERR_AR is for "Action Required" machine checks. This happens
when corrupted data is consumed or the application ran into an area
which has been known to be corrupted earlier. These require immediate
action and cannot just returned to. Most programs would kill themselves.
- They report the address of the corruption in the user address space
in si_addr.
- Define a new si_addr_lsb field that reports the extent of the corruption
to user space. That's currently always a (small) page. The user application
cannot tell where in this page the corruption happened.

AK: I plan to write a man page update before anyone asks.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      ad5fa913
    • A
      HWPOISON: Add support for poison swap entries v2 · a7420aa5
      由 Andi Kleen 提交于 
      Memory migration uses special swap entry types to trigger special actions on
page faults. Extend this mechanism to also support poisoned swap entries, to
trigger poison handling on page faults. This allows follow-on patches to
prevent processes from faulting in poisoned pages again.

v2: Fix overflow in MAX_SWAPFILES (Fengguang Wu)
v3: Better overflow fix (Hidehiro Kawai)
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      a7420aa5
    • A
      HWPOISON: Export some rmap vma locking to outside world · 10be22df
      由 Andi Kleen 提交于 
      Needed for later patch that walks rmap entries on its own.

This used to be very frowned upon, but memory-failure.c does
some rather specialized rmap walking and rmap has been stable
for quite some time, so I think it's ok now to export it.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      10be22df
    • A
      HWPOISON: Add page flag for poisoned pages · d466f2fc
      由 Andi Kleen 提交于 
      Hardware poisoned pages need special handling in the VM and shouldn't be
touched again. This requires a new page flag. Define it here.

The page flags wars seem to be over, so it shouldn't be a problem
to get a new one.

v2: Add TestSetHWPoison (suggested by Johannes Weiner)
Acked-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      d466f2fc
    • N
      Nicolas Pitre has a new email address · 2f82af08
      由 Nicolas Pitre 提交于 
      Due to problems at cam.org, my nico@cam.org email address is no longer
valid.  FRom now on, nico@fluxnic.net should be used instead.
Signed-off-by: NNicolas Pitre <nico@fluxnic.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      2f82af08
  3. 15 9月, 2009 3 次提交
  5. 14 9月, 2009 10 次提交
  7. 12 9月, 2009 16 次提交