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Date: Mon, 03 Aug 2009 10:13:46 +0800 From: Gui Jianfeng <guijianfeng@...fujitsu.com> To: Vivek Goyal <vgoyal@...hat.com> CC: linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org, dm-devel@...hat.com, jens.axboe@...cle.com, nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com, mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it, ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp, jmoyer@...hat.com, dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com, righi.andrea@...il.com, m-ikeda@...jp.nec.com, jbaron@...hat.com, agk@...hat.com, snitzer@...hat.com, akpm@...ux-foundation.org, peterz@...radead.org Subject: Re: [PATCH 20/25] io-controller: map async requests to appropriate cgroup Vivek Goyal wrote: ... > + > +struct io_group *io_get_io_group_bio(struct request_queue *q, struct bio *bio, > + int create) > +{ > + struct page *page = NULL; > + > + /* > + * Determine the group from task context. Even calls from > + * blk_get_request() which don't have any bio info will be mapped > + * to the task's group > + */ > + if (!bio) > + goto sync; > + > + if (bio_barrier(bio)) { > + /* > + * Map barrier requests to root group. May be more special > + * bio cases should come here > + */ > + return q->elevator->efqd.root_group; > + } > + > + /* Map the sync bio to the right group using task context */ > + if (elv_bio_sync(bio)) > + goto sync; > + > +#ifdef CONFIG_TRACK_ASYNC_CONTEXT > + /* Determine the group from info stored in page */ > + page = bio_iovec_idx(bio, 0)->bv_page; > + return io_get_io_group(q, page, create); > +#endif > + > +sync: > + return io_get_io_group(q, NULL, create); Fix build warning. block/elevator-fq.c: In function ‘io_get_io_group_bio’: block/elevator-fq.c:2075: warning: unused variable ‘page’ --- diff --git a/block/elevator-fq.c b/block/elevator-fq.c index 66b10eb..d304f79 100644 --- a/block/elevator-fq.c +++ b/block/elevator-fq.c @@ -2102,7 +2102,7 @@ struct io_group *io_get_io_group_bio(struct request_queue *q, struct bio *bio, #endif sync: - return io_get_io_group(q, NULL, create); + return io_get_io_group(q, page, create); } EXPORT_SYMBOL(io_get_io_group_bio); > +} > +EXPORT_SYMBOL(io_get_io_group_bio); > + -- Regards Gui Jianfeng -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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