From: Jason Gunthorpe Date: Sun, 16 Sep 2018 17:48:11 +0000 (+0300) Subject: RDMA/umem: Avoid synchronize_srcu in the ODP MR destruction path X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=56ac9dd9177ce451ac8176311915b29e8b5f0ac2;p=openwrt%2Fstaging%2Fblogic.git RDMA/umem: Avoid synchronize_srcu in the ODP MR destruction path synchronize_rcu is slow enough that it should be avoided on the syscall path when user space is destroying MRs. After all the rework we can now trivially do this by having call_srcu kfree the per_mm. Signed-off-by: Jason Gunthorpe Signed-off-by: Leon Romanovsky Signed-off-by: Doug Ledford --- diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c index d7b6422b9611..2b4c5e7dd5a1 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -307,6 +307,11 @@ found: return 0; } +static void free_per_mm(struct rcu_head *rcu) +{ + kfree(container_of(rcu, struct ib_ucontext_per_mm, rcu)); +} + void put_per_mm(struct ib_umem_odp *umem_odp) { struct ib_ucontext_per_mm *per_mm = umem_odp->per_mm; @@ -334,9 +339,10 @@ void put_per_mm(struct ib_umem_odp *umem_odp) per_mm->active = false; up_write(&per_mm->umem_rwsem); - mmu_notifier_unregister(&per_mm->mn, per_mm->mm); + WARN_ON(!RB_EMPTY_ROOT(&per_mm->umem_tree.rb_root)); + mmu_notifier_unregister_no_release(&per_mm->mn, per_mm->mm); put_pid(per_mm->tgid); - kfree(per_mm); + mmu_notifier_call_srcu(&per_mm->rcu, free_per_mm); } struct ib_umem_odp *ib_alloc_odp_umem(struct ib_ucontext_per_mm *per_mm, diff --git a/include/rdma/ib_umem_odp.h b/include/rdma/ib_umem_odp.h index ec05c82ead7a..0b1446fe2fab 100644 --- a/include/rdma/ib_umem_odp.h +++ b/include/rdma/ib_umem_odp.h @@ -99,6 +99,7 @@ struct ib_ucontext_per_mm { unsigned int odp_mrs_count; struct list_head ucontext_list; + struct rcu_head rcu; }; int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access);