Current memory policy code has some confusing and ambiguous part about
MPOL_LOCAL policy, as it is handled as a faked MPOL_PREFERRED one, and
there are many places having to distinguish them. Also the nodemask
intersection check needs cleanup to be more explicit for OOM use, and
handle MPOL_INTERLEAVE correctly. This patchset cleans up these and
unifies the parameter sanity check for mbind() and set_mempolicy(),
which helps to make further changes easier (notably MPOL_PREFERRED_MANY)
The patchset has been run with some sanity test like 'stress-ng'
and 'ltp', and no problem found.
Thanks,
Feng
Changelogs:
v4:
* fix a problem in mpol_set_nodemask() (Michal Hocko)
* update cover-letter and commit log (Andrew/Michal)
* add Acked-by info
v3:
* fix logic of mpol_rebind_preferred() (Michal Hocko)
v2:
* rename mempolicy_nodemask_intersects() to
mempolicy_in_oom_domain() and correct commit log (Michal Hocko)
* change the mpol syscall param sanity check (Michal Hocko)
* combine the 3/4 and 4/4 in v1 into one patch,
and further clean the logic (Michal Hocko)
v1:
* use helper func instead of macro for patch 2/4 (David Rientjes)
* fix a possible null pointer case in patch 3/4
* update commit log for 1/4
RFC v2:
* add for oom check fix patch 1/4
* add the unification patch for mpol preprocess 2/4
Feng Tang (3):
mm/mempolicy: cleanup nodemask intersection check for oom
mm/mempolicy: don't handle MPOL_LOCAL like a fake MPOL_PREFERRED
policy
mm/mempolicy: unify the parameter sanity check for mbind and
set_mempolicy
include/linux/mempolicy.h | 2 +-
include/uapi/linux/mempolicy.h | 1 -
mm/mempolicy.c | 213 ++++++++++++++++++-----------------------
mm/oom_kill.c | 2 +-
4 files changed, 94 insertions(+), 124 deletions(-)
--
2.7.4
