Re: -nice tree [was Re: [Swsusp-devel] Re: swsusp problems [was Re: Your opinion on the merge?]]

From: Pavel Machek (pavel_at_suse.cz)
Date: 03/26/04

  • Next message: Christoph Hellwig: "Re: [PATCH] lockfs patch for 2.6" 
    Date:	Fri, 26 Mar 2004 11:22:06 +0100
To: Michael Frank <mhf@linuxmail.org>

    Hi!

    > >>upgraded my laptop's hard drive, and found I wasn't getting the
    > >>performance improvements in suspending I expected. It turns out that the
    > >>CPU is now the limiting factor. Because I had the /proc interface, I
    > >>could easily adjust the debug settings to show me throughput and then
    > >>try a couple of suspend cycles with compression enabled and with it
    > >>disabled. Without the /proc interface, I would have had to have
    > >>recompiled the kernel to switch settings. (I didn't try gzip because I
    > >>knew it wasn't going to be a contender for me).
    > >
    >
    > /proc is needed a lot
    >
    > - enable escape
    > - select reboot mode
    > which is essential for multibooting. We use it all the time to
    > boot various installations of Linux

    Perhaps reboot() can have parameter for that.

    > - select compression none, lzw or gzip
    > none is used when disk faster that cpu-limited lzf
    > lzf is used when cpu is fast enough to compress to disk
    > Fast CPU can do 100MB/s+ to 50MB/s drives
    > gzip is used by some who care about image size eg flash users

    If you are doing "resume=swap:<something>", why not "resume=lzw-swap:something"?

    > - keep image mode (when compiled in)
    > which is used for embedded kiosks for example
    > Boeing requested and uses it

    Boeing can keep external patch, this seems like pretty dangerous
    feature for joe user. And it should not be selected at /proc, but as
    command line parameter.

    > - default console level
    > Controls console messages or nice display
    > - access debug info header
    > This is needed to analyze swsusp2 performance
    > - access resume parameters
    > Saves a reboot when changing parameters
    > - activate
    > swsusp2 activation independent of apci, apm

    Should not be needed. There's reboot() syscall to do that.

    > - last result
    > info on why swsusp2 did not suspend such as out of
    > memory or swap or freezing failure

    That should be return value of reboot() syscall.

                                                            Pavel 

    -- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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