Messages in this thread | | | From | Oliver Neukum <> | Subject | Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable) | Date | Mon, 18 Jan 2010 08:53:31 +0100 |
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Am Montag, 18. Januar 2010 00:00:23 schrieb Rafael J. Wysocki: > On Sunday 17 January 2010, Benjamin Herrenschmidt wrote: > > On Sun, 2010-01-17 at 14:27 +0100, Rafael J. Wysocki wrote: > ... > > However, it's hard to deal with the case of allocations that have > > already started waiting for IOs. It might be possible to have some VM > > hook to make them wakeup, re-evaluate the situation and get out of that > > code path but in any case it would be tricky. > > In the second version of the patch I used an rwsem that made us wait for these > allocations to complete before we changed gfp_allowed_mask.
This will be a very, very hot semaphore. What's the impact on performance?
Regards Oliver
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