[PATCH v3 0/2] Allow gmap fault to retry

From	Dominik Dingel <dingel@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	[PATCH v3 0/2] Allow gmap fault to retry
Date	2016-01-04 12:30 +0100
Message-ID	<qNbuN-2MN-5@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Show all headers | View raw

Hello,

sorry for the delay since the last version.

During Jasons work with postcopy migration support for s390 a problem regarding
gmap faults was discovered.

The gmap code will call fixup_user_fault which will end up always in
handle_mm_fault. Till now we never cared about retries, but as the userfaultfd
code kind of relies on it. this needs some fix.

This patchset does not take care of the futex code. I will now look closer at
this.

Thanks,
    Dominik

v2 -> v3:
- In case of retrying check vma again
- Do the accounting of major/minor faults once

v1 -> v2:
- Instread of passing the VM_FAULT_RETRY from fixup_user_fault we do retries
  within fixup_user_fault, like get_user_pages_locked do.
- gmap code will now take retry if fixup_user_fault drops the lock.

Dominik Dingel (2):
  mm: bring in additional flag for fixup_user_fault to signal unlock
  s390/mm: enable fixup_user_fault retrying

 arch/s390/mm/pgtable.c | 31 ++++++++++++++++++++++++++++---
 include/linux/mm.h     |  5 +++--
 kernel/futex.c         |  2 +-
 mm/gup.c               | 30 +++++++++++++++++++++++++-----
 4 files changed, 57 insertions(+), 11 deletions(-)

-- 
2.3.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH v3 0/2] Allow gmap fault to retry Dominik Dingel <dingel@linux.vnet.ibm.com> - 2016-01-04 12:30 +0100
  [PATCH 1/2] mm: bring in additional flag for fixup_user_fault to signal unlock Dominik Dingel <dingel@linux.vnet.ibm.com> - 2016-01-04 12:30 +0100
  Re: [PATCH v3 0/2] Allow gmap fault to retry Andrea Arcangeli <aarcange@redhat.com> - 2016-01-04 18:10 +0100

csiph-web