Writing caches
Just a small question, maybe I got a completely false impression... Why does software suspend have to save file cachess? Couldn't they just be flushed to save suspend and restore time?
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Quoted 3 lines · Stefan Tomanek
Just a small question, maybe I got a completely false impression... Why does software suspend have to save file cachess? Couldn't they just be flushed to save suspend and restore time?
If you write the caches to disk on suspend and re-read them on resume, the machine is much more responsive when it comes back on.
At least for me, that's much better. :)
Cheers,
Lorenzo
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Hi.
You can set a soft image size limit, and suspend2 will call shrink_all_memory (like swsusp does) to free pages until it reaches that limit (if possible). In this way it is possible to free caches before suspending. As Lorenzo said, though, this results in a much less responsive system post-resume. Suspend2 reads and writes the data as fast as it can (async I/O and readahead for what must be done synchronously due to compression, plus LZF compression), and the data is stored as contiguously as possible. This means it's much faster to write the data in the image instead of forcing pages to be reread/swapped in later.
Regards,
Nigel
Quoted 3 lines · Stefan Tomanek
Just a small question, maybe I got a completely false impression... Why does software suspend have to save file cachess? Couldn't they just be flushed to save suspend and restore time?
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Nigel Cunningham Software Engineer, Canberra, Australia http://www.cyclades.com Bus: +61 (2) 6291 9554; Hme: +61 (2) 6292 8028; Mob: +61 (417) 100 574 Maintainer of Suspend2 Kernel Patches http://suspend2.net ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click