[PATCH 0/4] more robust PF_MEMALLOC handling

Vlastimil Babka
2017-04-05T07:46:56Z

Hi,

this series aims to unify the setting and clearing of PF_MEMALLOC, which
prevents recursive reclaim. There are some places that clear the flag
unconditionally from current->flags, which may result in clearing a
pre-existing flag. This already resulted in a bug report that Patch 1 fixes
(without the new helpers, to make backporting easier). Patch 2 introduces the
new helpers, modelled after existing memalloc_noio_* and memalloc_nofs_*
helpers, and converts mm core to use them. Patches 3 and 4 convert non-mm code.

Based on next-20170404.

Vlastimil Babka (4):
mm: prevent potential recursive reclaim due to clearing PF_MEMALLOC
mm: introduce memalloc_noreclaim_{save,restore}
treewide: convert PF_MEMALLOC manipulations to new helpers
mtd: nand: nandsim: convert to memalloc_noreclaim_*()

drivers/block/nbd.c | 7 ++++---
drivers/mtd/nand/nandsim.c | 29 +++++++++--------------------
drivers/scsi/iscsi_tcp.c | 7 ++++---
include/linux/sched/mm.h | 12 ++++++++++++
mm/page_alloc.c | 10 ++++++----
mm/vmscan.c | 17 +++++++++++------
net/core/dev.c | 7 ++++---
net/core/sock.c | 7 ++++---
8 files changed, 54 insertions(+), 42 deletions(-)

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2.12.2