linux-kernel - Re: [PATCH v7 21/23] block: Avoid that flushing triggers a lockdep complaint

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Date:   Tue, 26 Feb 2019 19:08:02 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Bart Van Assche <bvanassche@....org>, mingo@...hat.com,
        will.deacon@....com, tj@...nel.org, longman@...hat.com,
        johannes.berg@...el.com, linux-kernel@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>, Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH v7 21/23] block: Avoid that flushing triggers a lockdep
 complaint

On Fri, Feb 15, 2019 at 10:26:59AM +0800, Ming Lei wrote:
> There might be lots of blk_flush_queue instance which is allocated
> for each hctx, then lots of class key slot may be wasted.

What is 'lots' ? for someone who doesn't really know all that much about
the block layer.