Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 17 Aug 2009 17:50:21 +0800 | From | Amerigo Wang <> | Subject | Re: [Patch 8/8] kexec: allow to shrink reserved memory |
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Eric W. Biederman wrote: > Amerigo Wang <amwang@redhat.com> writes: > > >> Not that simple, marking it as "__init" means it uses some "__init" data which >> will be dropped after initialization. >> > > If we start with the assumption that we will be reserving to much and > will free the memory once we know how much we really need I see a very > simple way to go about this. We ensure that the reservation of crash > kernel memory is done through a normal allocation so that we have > struct page entries for every page. On 32bit x86 that is an extra 1MB > for a 128MB allocation. > > Then when it comes time to release that memory we clear whatever magic > flags we have on the page (like PG_reserve) and call free_page. >
Hmm, my MM knowledge is not good enough to judge if this works... I need to check more MM source code.
Can any MM people help?
Thanks.
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