diff options
| author | Gabriel Krisman Bertazi <krisman@collabora.com> | 2020-10-22 16:58:42 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-10-26 07:57:47 -0600 |
| commit | f255c19b3ab46d3cad3b1b2e1036f4c926cb1d0c (patch) | |
| tree | 7cfc8b4e2a8ad387349116137844b81e9264cb0b /net/mptcp | |
| parent | 52abfcbd57eefdd54737fc8c2dc79d8f46d4a3e5 (diff) | |
blk-cgroup: Pre-allocate tree node on blkg_conf_prep
Similarly to commit 457e490f2b741 ("blkcg: allocate struct blkcg_gq
outside request queue spinlock"), blkg_create can also trigger
occasional -ENOMEM failures at the radix insertion because any
allocation inside blkg_create has to be non-blocking, making it more
likely to fail. This causes trouble for userspace tools trying to
configure io weights who need to deal with this condition.
This patch reduces the occurrence of -ENOMEMs on this path by preloading
the radix tree element on a GFP_KERNEL context, such that we guarantee
the later non-blocking insertion won't fail.
A similar solution exists in blkcg_init_queue for the same situation.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'net/mptcp')
0 files changed, 0 insertions, 0 deletions