Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752228AbcJBBrF (ORCPT ); Sat, 1 Oct 2016 21:47:05 -0400 Received: from frisell.zx2c4.com ([192.95.5.64]:37406 "EHLO frisell.zx2c4.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751296AbcJBBq5 (ORCPT ); Sat, 1 Oct 2016 21:46:57 -0400 From: "Jason A. Donenfeld" To: Steffen Klassert , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH] padata: add helper function for queue length Date: Sun, 2 Oct 2016 03:46:38 +0200 Message-Id: <20161002014638.8049-1-Jason@zx2c4.com> X-Mailer: git-send-email 2.10.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2209 Lines: 61 Since padata has a maximum number of inflight jobs, currently 1000, it's very useful to know how many jobs are currently queued up. This adds a simple helper function to expose this information. Signed-off-by: Jason A. Donenfeld --- include/linux/padata.h | 2 ++ kernel/padata.c | 16 ++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/include/linux/padata.h b/include/linux/padata.h index 113ee62..4840ae4 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -3,6 +3,7 @@ * * Copyright (C) 2008, 2009 secunet Security Networks AG * Copyright (C) 2008, 2009 Steffen Klassert + * Copyright (C) 2016 Jason A. Donenfeld * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, @@ -181,4 +182,5 @@ extern int padata_register_cpumask_notifier(struct padata_instance *pinst, struct notifier_block *nblock); extern int padata_unregister_cpumask_notifier(struct padata_instance *pinst, struct notifier_block *nblock); +extern int padata_queue_len(struct padata_instance *pinst); #endif diff --git a/kernel/padata.c b/kernel/padata.c index 9932788..17c1e08 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -5,6 +5,7 @@ * * Copyright (C) 2008, 2009 secunet Security Networks AG * Copyright (C) 2008, 2009 Steffen Klassert + * Copyright (C) 2016 Jason A. Donenfeld * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, @@ -1039,3 +1040,18 @@ void padata_free(struct padata_instance *pinst) kobject_put(&pinst->kobj); } EXPORT_SYMBOL(padata_free); + +/** + * padata_queue_len - retreive the number of in progress jobs + * + * @padata_inst: padata instance from which to read the queue size + */ +int padata_queue_len(struct padata_instance *pinst) +{ + int len; + rcu_read_lock_bh(); + len = atomic_read(&rcu_dereference_bh(pinst->pd)->refcnt); + rcu_read_unlock_bh(); + return len; +} +EXPORT_SYMBOL(padata_queue_len); -- 2.10.0