From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: per-bdi-throttling: synchronous writepage doesn't work correctly From: Peter Zijlstra In-Reply-To: References: Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-+IH5pBr/RFpTdEnqiKUa" Date: Thu, 01 Nov 2007 17:51:26 +0100 Message-Id: <1193935886.27652.313.camel@twins> Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org Return-Path: To: Miklos Szeredi Cc: jdike@addtoit.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: --=-+IH5pBr/RFpTdEnqiKUa Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Thu, 2007-11-01 at 17:49 +0100, Miklos Szeredi wrote: > Hi, >=20 > It looks like bdi_thresh will always be zero if filesystem does > synchronous writepage, resulting in very poor write performance. >=20 > Hostfs (UML) is one such example, but there might be others. >=20 > The only solution I can think of is to add a set_page_writeback(); > end_page_writeback() pair (or some reduced variant, that only does > the proportions magic). But that means auditing quite a few > filesystems... Ouch... I take it there is no other function that is shared between all these writeout paths which we could stick a bdi_writeout_inc(bdi) in? --=-+IH5pBr/RFpTdEnqiKUa Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQBHKgQOXA2jU0ANEf4RAhiYAJ44hDATljNoWYlCgibJPWuO62wb8ACfQ7DX DV5aDiMcAQ+d5I7ON7fqWwg= =Xtzl -----END PGP SIGNATURE----- --=-+IH5pBr/RFpTdEnqiKUa-- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org