Messages in this thread | | | Subject | Re: [PATCH]Fix: Init page count for all pages during higher order allocs | From | (Eric W. Biederman) | Date | 29 Apr 2002 11:40:21 -0600 |
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Suparna Bhattacharya <suparna@in.ibm.com> writes:
> The call to set_page_count(page, 1) in page_alloc.c appears to happen > only for the first page, for order 1 and higher allocations. > This leaves the count for the rest of the pages in that block > uninitialised.
Actually it should be zero.
This is deliberate because high order pages should not be referenced by their partial pages. It might make sense to add a PG_large flag and then in the immediately following struct page add a pointer to the next page, so you can identify these pages by inspection. Doing something similar to the PG_skip flag.
Beyond that I get nervous, that people will treat it as endorsement of doing a high order continuous allocation and then fragmenting the page.
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