Re: block layer runtime pm and udisks
On 10/10/2013 09:40 AM, Phillip Susi wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA512 > > I have been trying out the new block layer runtime pm, and run into a > problem: udisks keeps waking up the disk. Every 10 minutes it tries > to poll the SMART status of the drive, but it does first issue an ata > CHECK POWER command to see if it is in standby, and skips the check to > avoid waking the disk. The problem with runtime pm is that *any* > request brings the drive out of suspend, and the suspend wake path > forces the drive to spin up by issuing a verify command on sector 0. > > Is there a reason that the wakeup path forces the drive to spin up, or > could this be removed and rely on the drive waking up automatically if > the request requires it? > > Or would it be possible to notice that the command being sent is a > check power command, and fake the reply instead of resuming the device? > > Or does udisks just need to check the runtime pm status before trying > the check power command? I think the udisks can be modified to check if the drive is runtime suspended and if so, avoid poll the SMART status. Thanks, Aaron > > > -BEGIN PGP SIGNATURE- > Version: GnuPG v1.4.14 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBCgAGBQJSVgWPAAoJEJrBOlT6nu75k/cH+gMAb9YtMS21rEt94umJpBYj > BcNoyGoK39tAKZHW7pXfP2hRIm1+kPTPi44Wp7kQHu7m6BSp4YetmDkqjNv+6yAy > 8SUvPcqRsJVbF1oBXN09phBEnk/JfxqID7n6hB1lT6NqYV72VVVUEUOlnSnpHtDJ > gszV+TLH37uhd5/KiDFja3J2bJC0R/klzDF1x1clc53tGJd1NZ+h9tZZBLszIdnS > EnjukLA02Q7ooq+445WyWth2cypTXKfRbigZW+FfCI3hfAKOShVevodlGmmrQb7Z > 0xzhSoO5JTpNqJPLaNL3+JZFdXwANd+7PuO9v2XVKKUkydQ9+Vl4CfydSFhqo5U= > =iuSZ > -END PGP SIGNATURE- > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: block layer runtime pm and udisks
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 I have been trying out the new block layer runtime pm, and run into a problem: udisks keeps waking up the disk. Every 10 minutes it tries to poll the SMART status of the drive, but it does first issue an ata CHECK POWER command to see if it is in standby, and skips the check to avoid waking the disk. The problem with runtime pm is that *any* request brings the drive out of suspend, and the suspend wake path forces the drive to spin up by issuing a verify command on sector 0. Is there a reason that the wakeup path forces the drive to spin up, or could this be removed and rely on the drive waking up automatically if the request requires it? Or would it be possible to notice that the command being sent is a check power command, and fake the reply instead of resuming the device? Or does udisks just need to check the runtime pm status before trying the check power command? -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCgAGBQJSVgWPAAoJEJrBOlT6nu75k/cH+gMAb9YtMS21rEt94umJpBYj BcNoyGoK39tAKZHW7pXfP2hRIm1+kPTPi44Wp7kQHu7m6BSp4YetmDkqjNv+6yAy 8SUvPcqRsJVbF1oBXN09phBEnk/JfxqID7n6hB1lT6NqYV72VVVUEUOlnSnpHtDJ gszV+TLH37uhd5/KiDFja3J2bJC0R/klzDF1x1clc53tGJd1NZ+h9tZZBLszIdnS EnjukLA02Q7ooq+445WyWth2cypTXKfRbigZW+FfCI3hfAKOShVevodlGmmrQb7Z 0xzhSoO5JTpNqJPLaNL3+JZFdXwANd+7PuO9v2XVKKUkydQ9+Vl4CfydSFhqo5U= =iuSZ -END PGP SIGNATURE- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: block layer runtime pm and udisks
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 I have been trying out the new block layer runtime pm, and run into a problem: udisks keeps waking up the disk. Every 10 minutes it tries to poll the SMART status of the drive, but it does first issue an ata CHECK POWER command to see if it is in standby, and skips the check to avoid waking the disk. The problem with runtime pm is that *any* request brings the drive out of suspend, and the suspend wake path forces the drive to spin up by issuing a verify command on sector 0. Is there a reason that the wakeup path forces the drive to spin up, or could this be removed and rely on the drive waking up automatically if the request requires it? Or would it be possible to notice that the command being sent is a check power command, and fake the reply instead of resuming the device? Or does udisks just need to check the runtime pm status before trying the check power command? -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCgAGBQJSVgWPAAoJEJrBOlT6nu75k/cH+gMAb9YtMS21rEt94umJpBYj BcNoyGoK39tAKZHW7pXfP2hRIm1+kPTPi44Wp7kQHu7m6BSp4YetmDkqjNv+6yAy 8SUvPcqRsJVbF1oBXN09phBEnk/JfxqID7n6hB1lT6NqYV72VVVUEUOlnSnpHtDJ gszV+TLH37uhd5/KiDFja3J2bJC0R/klzDF1x1clc53tGJd1NZ+h9tZZBLszIdnS EnjukLA02Q7ooq+445WyWth2cypTXKfRbigZW+FfCI3hfAKOShVevodlGmmrQb7Z 0xzhSoO5JTpNqJPLaNL3+JZFdXwANd+7PuO9v2XVKKUkydQ9+Vl4CfydSFhqo5U= =iuSZ -END PGP SIGNATURE- -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: block layer runtime pm and udisks
On 10/10/2013 09:40 AM, Phillip Susi wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA512 I have been trying out the new block layer runtime pm, and run into a problem: udisks keeps waking up the disk. Every 10 minutes it tries to poll the SMART status of the drive, but it does first issue an ata CHECK POWER command to see if it is in standby, and skips the check to avoid waking the disk. The problem with runtime pm is that *any* request brings the drive out of suspend, and the suspend wake path forces the drive to spin up by issuing a verify command on sector 0. Is there a reason that the wakeup path forces the drive to spin up, or could this be removed and rely on the drive waking up automatically if the request requires it? Or would it be possible to notice that the command being sent is a check power command, and fake the reply instead of resuming the device? Or does udisks just need to check the runtime pm status before trying the check power command? I think the udisks can be modified to check if the drive is runtime suspended and if so, avoid poll the SMART status. Thanks, Aaron -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCgAGBQJSVgWPAAoJEJrBOlT6nu75k/cH+gMAb9YtMS21rEt94umJpBYj BcNoyGoK39tAKZHW7pXfP2hRIm1+kPTPi44Wp7kQHu7m6BSp4YetmDkqjNv+6yAy 8SUvPcqRsJVbF1oBXN09phBEnk/JfxqID7n6hB1lT6NqYV72VVVUEUOlnSnpHtDJ gszV+TLH37uhd5/KiDFja3J2bJC0R/klzDF1x1clc53tGJd1NZ+h9tZZBLszIdnS EnjukLA02Q7ooq+445WyWth2cypTXKfRbigZW+FfCI3hfAKOShVevodlGmmrQb7Z 0xzhSoO5JTpNqJPLaNL3+JZFdXwANd+7PuO9v2XVKKUkydQ9+Vl4CfydSFhqo5U= =iuSZ -END PGP SIGNATURE- -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
