@@ -508,6 +508,7 @@ int nfs_client_return_marked_delegations(struct nfs_client *clp)
err = nfs_end_delegation_return(inode, delegation, 0);
iput(inode);
nfs_sb_deactive(server->super);
+ cond_resched();
if (!err)
goto restart;
set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
@@ -904,6 +905,7 @@ void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
}
iput(inode);
nfs_sb_deactive(server->super);
+ cond_resched();
goto restart;
}
}
@@ -1020,6 +1022,7 @@ void nfs_reap_expired_delegations(struct nfs_client *clp)
}
iput(inode);
nfs_sb_deactive(server->super);
+ cond_resched();
goto restart;
}
}
In three places we walk the list of delegations for an nfs_client until an interesting one is found, then we act of that delegation and restart the walk. New delegations are added to the end of a list and the interesting delegations are usually old, so in many case we won't repeat a long walk over and over again, but it is possible - particularly if the first server in the list has a large number of uninteresting delegations. In each cache the work done on interesting delegations will often complete without sleeping, so this could loop many times without giving up the CPU. So add a cond_resched() at an appropriate point to avoid hogging the CPU for too long. Signed-off-by: NeilBrown <neilb@suse.com> --- fs/nfs/delegation.c | 3 +++ 1 file changed, 3 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html