Re: [opensuse-kernel] CONFIG_DEBUG_BLOCK_EXT_DEVT in master
Hello, again. On 04/13/2010 02:38 PM, Tejun Heo wrote:
This was added to help development and testing. Enabling the config option itself doesn't cost anything noticeable so it was left alone. Now that we have ext devt handling right, we don't need this anymore. I'll kill it.
I see what happened. The commit enabled the debug option and added a module param which further conditioned actual enabling so that the debug feature is not enabled by default. While moving to new kernel, the module param got dropped so that debug option became enabled by default. Anyways, I just disabled it on master. Thanks. -- tejun -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-kernel+help@opensuse.org
On Tue, 13 Apr 2010, Tejun Heo wrote:
This was added to help development and testing. Enabling the config option itself doesn't cost anything noticeable so it was left alone. Now that we have ext devt handling right, we don't need this anymore. I'll kill it.
I see what happened. The commit enabled the debug option and added a module param which further conditioned actual enabling so that the debug feature is not enabled by default. While moving to new kernel, the module param got dropped so that debug option became enabled by default. Anyways, I just disabled it on master.
I see, thanks a lot for doing it. So the rumors about this being needed for being able to handle more than 15 partitions via libata were not true, right? Thanks, -- Jiri Kosina SUSE Labs, Novell Inc. -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-kernel+help@opensuse.org
Hello, On 04/13/2010 06:21 PM, Jiri Kosina wrote:
So the rumors about this being needed for being able to handle more than 15 partitions via libata were not true, right?
Nope, not true. The debug option forces block layer to assign block device numbers semi randomly so that userland code paths which assume contiguos block number allocation can be easily identified. It's a feature to help debugging userland. Thanks. -- tejun -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-kernel+help@opensuse.org
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 04/13/2010 05:37 AM, Tejun Heo wrote:
Hello,
On 04/13/2010 06:21 PM, Jiri Kosina wrote:
So the rumors about this being needed for being able to handle more than 15 partitions via libata were not true, right?
Nope, not true. The debug option forces block layer to assign block device numbers semi randomly so that userland code paths which assume contiguos block number allocation can be easily identified. It's a feature to help debugging userland.
Oh, duh, you're right. I overlooked the "debug" part in the option. - -Jeff - -- Jeff Mahoney SUSE Labs -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.15 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org/ iEYEARECAAYFAkvEfMIACgkQLPWxlyuTD7LshwCfSKsSPau3M/6mawG3G64QHU74 AEwAoIS0aaxOFYMv9bxyyo2UpoVmriTH =flxq -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-kernel+help@opensuse.org
participants (3)
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Jeff Mahoney -
Jiri Kosina -
Tejun Heo