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Re: [PATCH] Remove process freezer from suspend to RAM pathway

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To: Nigel Cunningham <nigel@...>
Cc: Matthew Garrett <mjg59@...>, <linux-kernel@...>, <linux-pm@...>
Date: Tuesday, July 3, 2007 - 1:48 am

> Note, though, that this won't help at all when people use the "suspend-to-ram 

No, Fuse is not a broken idea in the first place. It's the freezer that
is a totally broken idea. It has proven many times to be racy by design
and cannot be made right. Ther usermode helper mess is just part of
that, fuse is another example, etc etc ...

So I think Matthew is totally right. In fact, the presence of the
freezer is the main reason why Paulus so far NACKed Johannes attempts at
merging the PPC PM code with the generic code in kernel/power.c

We've been doing fine without it so far and intend to continue to do so.

As for suspend-to-disk, I refer you to the discussions we had in the
past with Linus, where he explains I think quite clearly how wrong the
current implementation of STR is :-)

Thing is, if you're going to do snapshots, you should probably not sync
after you have "frozen" anyway.

Cheers,
Ben.


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Messages in current thread:
[PATCH] Remove process freezer from suspend to RAM pathway, Matthew Garrett, (Tue Jul 3, 12:29 am)
Re: sysrq-t dumps of s2ram/fuse deadlock, Jeremy Maitin-Shepard, (Wed Jul 11, 9:45 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Tue Jul 3, 1:48 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Tue Jul 3, 3:19 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Tue Jul 3, 5:14 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Thu Jul 5, 6:46 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Thu Jul 5, 7:20 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Thu Jul 5, 11:54 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Fri Jul 6, 12:41 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sat Jul 7, 12:06 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sat Jul 7, 8:48 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 1:14 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 5:20 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Mon Jul 9, 6:05 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Mon Jul 9, 5:13 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Mon Jul 9, 5:33 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 8:33 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 9:32 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 5:03 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 5:54 pm)
Re: hibernation/snapshot design, Jeremy Maitin-Shepard, (Mon Jul 9, 11:23 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 1:19 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Thu Jul 5, 11:59 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Fri Jul 6, 11:44 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sat Jul 7, 8:42 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 12:39 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sun Jul 8, 5:21 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Mon Jul 9, 5:14 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Sat Jul 7, 8:40 pm)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Fri Jul 6, 5:03 am)
The big suspend mess, Adrian Bunk, (Wed Jul 4, 6:19 pm)
Re: [linux-pm] The big suspend mess, Alan Stern, (Thu Jul 5, 10:14 am)
Re: The big suspend mess, Pavel Machek, (Wed Jul 4, 8:27 pm)
Re: The big suspend mess, Adrian Bunk, (Wed Jul 4, 9:22 pm)
Re: The big suspend mess, Rafael J. Wysocki, (Thu Jul 5, 8:18 am)
Re: The big suspend mess, Paul Mackerras, (Wed Jul 4, 8:53 pm)
Re: The big suspend mess, Pavel Machek, (Thu Jul 5, 5:32 am)
Re: The big suspend mess, Gabriel C, (Thu Jul 5, 6:29 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Rafael J. Wysocki, (Wed Jul 4, 10:30 am)
Re: [PATCH] Remove process freezer from suspend to RAM pathway, Benjamin Herrenschmidt, (Tue Jul 3, 5:35 pm)
Re: removing refrigerator does not help with s2ram vs. fuse ..., Rafael J. Wysocki, (Thu Jul 5, 10:28 am)
Re: removing refrigerator does not help with s2ram vs. fuse ..., Rafael J. Wysocki, (Thu Jul 5, 10:41 am)
Re: removing refrigerator does not help with s2ram vs. fuse ..., Rafael J. Wysocki, (Thu Jul 5, 11:04 am)
Re: removing refrigerator does not help with s2ram vs. fuse ..., Rafael J. Wysocki, (Thu Jul 5, 11:27 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Thu Jul 5, 6:59 pm)
Re: malicious filesystems (was Re: [linux-pm] Re: [PATCH] Re..., Rafael J. Wysocki, (Sun Jul 8, 10:06 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Thu Jul 5, 7:05 pm)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Jeremy Maitin-Shepard, (Thu Jul 5, 11:59 pm)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Fri Jul 6, 4:59 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Fri Jul 6, 10:44 pm)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Sat Jul 7, 8:50 pm)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Fri Jul 6, 10:46 pm)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Rafael J. Wysocki, (Thu Jul 5, 10:14 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Thu Jul 5, 6:38 pm)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Rafael J. Wysocki, (Thu Jul 5, 10:02 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Rafael J. Wysocki, (Thu Jul 5, 10:09 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Jeremy Maitin-Shepard, (Thu Jul 5, 12:06 pm)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Rafael J. Wysocki, (Thu Jul 5, 10:59 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Rafael J. Wysocki, (Tue Jul 3, 11:22 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Rafael J. Wysocki, (Tue Jul 3, 10:51 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Tue Jul 3, 7:45 am)
Re: [linux-pm] Re: [PATCH] Remove process freezer from suspe..., Benjamin Herrenschmidt, (Tue Jul 3, 7:44 am)