Re: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file

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To: Jeff Moyer <jmoyer@xxxxxxxxxx>
Subject: Re: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
From: Zach Brown <zab@xxxxxxxxx>
Date: Fri, 20 Apr 2012 13:48:17 -0400
Cc: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>, "Maxim V. Patlasov" <mpatlasov@xxxxxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <x49aa26wedf.fsf@segfault.boston.devel.redhat.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120329 Thunderbird/11.0.1

Bypassing the page cache is different from bypassing the underlying
device's cache.  O_DIRECT does not mean "straight to platter".


Sure, sure, you and I know that.

They most certainly should be!


Are they?

I have my guess.

- z
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References:
- [RFC PATCH v2 00/21] loop: Issue O_DIRECT aio using bio_vec
  - From: Dave Kleikamp
- [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
  - From: Dave Kleikamp
- Re: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
  - From: Maxim V. Patlasov
- Re: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
  - From: Dave Kleikamp
- Re: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
  - From: Jeff Moyer
- Re: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
  - From: Zach Brown
- Re: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
  - From: Jeff Moyer

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