This small patchset introduces a non-blocking version of cma_release()
and simplifies the code in hugetlbfs, where previously we had to
temporarily drop hugetlb_lock around the cma_release() call.
It should help Zi Yan on his work on 1 GB THPs: splitting a gigantic
THP under a memory pressure requires a cma_release() call. If it's
a blocking function, it complicates the already complicated code.
Because there are at least two use cases like this (hugetlbfs is
another example), I believe it's just better to make cma_release()
non-blocking.
v1:
- introduce cma_release_nowait() instead of making cma_release()
non-blocking, for performance reasons
rfc:
https://lkml.org/lkml/2020/10/16/1050
Roman Gushchin (2):
mm: cma: introduce cma_release_nowait()
mm: hugetlb: don't drop hugetlb_lock around cma_release() call
include/linux/cma.h | 2 +
mm/cma.c | 93 +++++++++++++++++++++++++++++++++++++++++++++
mm/cma.h | 5 +++
mm/hugetlb.c | 11 ++----
4 files changed, 103 insertions(+), 8 deletions(-)
--
2.26.2
