[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <E1IlQlP-0007W9-00@dorka.pomaz.szeredi.hu>
Date: Fri, 26 Oct 2007 17:06:19 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: peterz@...radead.org
CC: kay.sievers@...y.org, nickpiggin@...oo.com.au,
akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
jens.axboe@...cle.com, fengguang.wu@...il.com, greg@...ah.com,
trond.myklebust@....uio.no, miklos@...redi.hu
Subject: Re: per BDI dirty limit (was Re: -mm merge plans for 2.6.24)
> Subject: bdi: debugfs interface
>
> Expose the BDI stats (and readahead window) in /debug/bdi/
>
> I'm still thinking it should go into /sys somewhere, however I just noticed
> not all block devices that have a queue have a /queue directory. Noticeably
> those that use make_request_fn() as opposed to request_fn(). And then of
> course there are the non-block/non-queue BDIs.
>
> A BDI is basically the object that represents the 'thing' you dirty pages
> against. For block devices that is related to the block device (and is
> typically embedded in the queue object), for NFS mounts its the remote server
> object of the client. For FUSE, yet again something else.
>
> I appreciate the sysfs people their opinion that /sys/bdi/ might not be the
> best from their POV, however I'm not seeing where to hook the BDI object from
> so that it all makes sense, a few of the things are currently not exposed in
> sysfs at all, like the NFS and FUSE things.
>
> So, for now, I've exposed the thing in debugfs. Please suggest a better
> alternative.
>
> Miklos, Trond: could you suggest a better fmt for the bdi_init_fmt() for your
> respective filesystems?
For fuse:
err = bdi_init_fmt(&fc->bdi, "fuse-%llu", (unsigned long long) fc->id);
This would match the connection ID in /sys/fs/fuse/connections/*
Miklos
-
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/
Powered by blists - more mailing lists