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Date: Tue, 11 Sep 2012 00:45:34 +0100 From: Alasdair G Kergon <agk@...hat.com> To: Tejun Heo <tj@...nel.org> Cc: Kent Overstreet <koverstreet@...gle.com>, axboe@...nel.dk, device-mapper development <dm-devel@...hat.com>, david@...morbit.com, linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>, bharrosh@...asas.com, Vivek Goyal <vgoyal@...hat.com> Subject: Re: [dm-devel] [PATCH 2/2] block: Avoid deadlocks with bio allocation by stacking drivers On Mon, Sep 10, 2012 at 04:35:02PM -0700, Tejun Heo wrote: > debug. Would it be difficult to convert dm drivers to collect size > requirements and use front-pad for all per-bio data? I can't give a quick answer because a single bio may require a variable number (depending on the bio content) of (sequential) mempool_allocs from the same mempool to complete its processing, so we do have to audit all this very carefully to see what can/can't be pulled out. Alasdair -- 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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