From: Jeff Garzik <jgarzik@pobox.com>
To: Tejun Heo <htejun@gmail.com>, axboe@suse.de
Cc: alan@lxorguk.ukuu.org.uk, lkml@rtr.ca, forrest.zhao@intel.com,
linux-ide@vger.kernel.org
Subject: Re: [PATCH 09/12] libata: implement powersave timer
Date: Wed, 19 Jul 2006 15:48:21 -0400 [thread overview]
Message-ID: <44BE8C85.2080008@pobox.com> (raw)
In-Reply-To: <11531191522801-git-send-email-htejun@gmail.com>
Tejun Heo wrote:
> Implement powersave timer. It is primarily for OS-driven HIPS
> implementation but can be used for any other PS purpose LLD sees fit.
> During normal operation, PS timer is automatically started with
> timeout ap->ps_timeout on port idle and stopped when the port becomes
> busy. The timer is also stopped while EH.
>
> To minimize overhead and allow easy implementation of expected
> operation model, ata_ps_timer_worker() is used as timer callback which
> invokes LLD supplied ap->ps_timer_fn() if condition meets and also
> helps implementing sequenced multi-step operation.
>
> Signed-off-by: Tejun Heo <htejun@gmail.com>
This makes me wonder what Jens thinks about having a device idle timer
and callback at the block level? At the very least, this feels like it
should be implemented in the SCSI layer, or somewhere other than libata.
This is NOT a NAK, however. The code looks OK, and if consensus is
against doing this sort of thing in block or SCSI, then I'm OK with the
current patch.
next prev parent reply other threads:[~2006-07-19 19:48 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-17 6:52 [PATCHSET] libata: implement runtime link powersave Tejun Heo
2006-07-17 6:52 ` [PATCH 01/12] libata: add msec_to_jiffies() Tejun Heo
2006-07-17 6:52 ` [PATCH 02/12] libata: add ata_id_has_sata() and use it in ata_id_has_ncq() Tejun Heo
2006-07-17 6:52 ` [PATCH 04/12] libata: implement ata_all_ports list Tejun Heo
2006-07-19 19:34 ` Jeff Garzik
2006-07-17 6:52 ` [PATCH 03/12] libata: add more SATA specific constants and macros to ata.h Tejun Heo
2006-07-19 19:32 ` Jeff Garzik
2006-07-17 6:52 ` [PATCH 09/12] libata: implement powersave timer Tejun Heo
2006-07-19 19:48 ` Jeff Garzik [this message]
2006-07-19 20:22 ` Jens Axboe
2006-07-24 7:27 ` Tejun Heo
2006-07-25 8:01 ` Jens Axboe
2006-07-17 6:52 ` [PATCH 05/12] libata: make counting functions global Tejun Heo
2006-07-17 6:52 ` [PATCH 07/12] libata: implement sata_update_scontrol() Tejun Heo
2006-07-19 19:35 ` Jeff Garzik
2006-07-17 6:52 ` [PATCH 11/12] ahci: implement link powersave Tejun Heo
2006-07-19 19:51 ` Jeff Garzik
2006-07-17 6:52 ` [PATCH 08/12] libata: implement interface power management infrastructure Tejun Heo
2006-07-19 19:45 ` Jeff Garzik
2006-07-24 8:02 ` Tejun Heo
2006-07-17 6:52 ` [PATCH 10/12] libata: implement standard powersave methods Tejun Heo
2006-07-19 19:50 ` Jeff Garzik
2006-07-17 6:52 ` [PATCH 06/12] libata: add ata_port_nr_ready() Tejun Heo
2006-07-17 6:52 ` [PATCH 12/12] sata_sil24: implement link powersave Tejun Heo
2006-07-19 19:38 ` [PATCHSET] libata: implement runtime " Jeff Garzik
2006-07-24 7:33 ` Tejun Heo
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