diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2019-02-06 20:59:17 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-02-07 22:54:02 +0300 |
| commit | 3a2a1e90564e3ad215aa5c6ddc0e741cd6208a93 (patch) | |
| tree | e6abdb64e1af8e20a1a4204dca5f7f9388358c46 /tools/perf/scripts/python/sched-migration.py | |
| parent | 4f564ff3d4dd887955b25b83d06989610769bf32 (diff) | |
| download | linux-3a2a1e90564e3ad215aa5c6ddc0e741cd6208a93.tar.xz | |
drivers/IB,qib: optimize mmap_sem usage
The driver uses mmap_sem for both pinned_vm accounting and
get_user_pages(). Because rdma drivers might want to use gup_longterm() in
the future we still need some sort of mmap_sem serialization (as opposed
to removing it entirely by using gup_fast()). Now that pinned_vm is atomic
the writer lock can therefore be converted to reader.
This also fixes a bug that __qib_get_user_pages was not taking into
account the current value of pinned_vm.
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'tools/perf/scripts/python/sched-migration.py')
0 files changed, 0 insertions, 0 deletions