Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756931Ab3JKHYF (ORCPT ); Fri, 11 Oct 2013 03:24:05 -0400 Received: from mail-ie0-f170.google.com ([209.85.223.170]:46663 "EHLO mail-ie0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756247Ab3JKHYD (ORCPT ); Fri, 11 Oct 2013 03:24:03 -0400 Message-Id: <20131011072341.346343362@kernel.org> User-Agent: quilt/0.60-1 Date: Fri, 11 Oct 2013 15:18:05 +0800 From: Shaohua Li To: linux-kernel@vger.kernel.org, axboe@kernel.dk Cc: kmo@daterainc.com Subject: [patch 3/4] percpu_ida: add an API to return free tags References: <20131011071802.148101321@kernel.org> Content-Disposition: inline; filename=0003-percpu_ida-add-an-API-to-return-free-tags.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1830 Lines: 49 add an API to return free tags, blk-mq-tag will use it Signed-off-by: Shaohua Li --- include/linux/percpu_ida.h | 1 + lib/percpu_ida.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) Index: master/include/linux/percpu_ida.h =================================================================== --- master.orig/include/linux/percpu_ida.h 2013-10-11 12:15:06.996416710 +0800 +++ master/include/linux/percpu_ida.h 2013-10-11 12:15:06.992416749 +0800 @@ -76,4 +76,5 @@ static inline int percpu_ida_init(struct int percpu_ida_for_each_free(struct percpu_ida *pool, int (*fn)(int id, void *data), void *data); +unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu); #endif /* __PERCPU_IDA_H__ */ Index: master/lib/percpu_ida.c =================================================================== --- master.orig/lib/percpu_ida.c 2013-10-11 12:15:06.996416710 +0800 +++ master/lib/percpu_ida.c 2013-10-11 12:15:06.992416749 +0800 @@ -371,3 +371,20 @@ out: return err; } EXPORT_SYMBOL_GPL(percpu_ida_for_each_free); + +/** + * percpu_ida_free_tags - return free tags number of a specific cpu or global pool + * @pool: pool related + * @cpu: specific cpu or global pool if @cpu == nr_cpu_ids + * + * Note: this just returns a snapshot of free tags number. + */ +unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu) +{ + struct percpu_ida_cpu *remote; + if (cpu == nr_cpu_ids) + return pool->nr_free; + remote = per_cpu_ptr(pool->tag_cpu, cpu); + return remote->nr_free; +} +EXPORT_SYMBOL_GPL(percpu_ida_free_tags); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/