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Hi Aubery! Aubrey wrote: > Hi Nick, > > Thanks for your reply again, ;-). > > On 12/19/06, Nick Piggin <nickpiggin@yahoo.com.au> wrote: > >> >> This should not happen because the pages are checked to ensure they are >> from the same zone before merging. > > > How? page_is_buddy() only check if the buddy has the buddy flag and > has the same order. > Where can I find the same zone is checked? Ah OK, you're using 2.6.16? Later kernels have a check for this. I guess you could backport it? > >> >> What kind of system do you have? What is the dmesg and the .config? > > > I'm using the blackfin uclinux. dmesg and .config is attached. > >> It could be that the zones are not properly aligned and >> CONFIG_HOLES_IN_ZONE >> is not set. > > > I changed the code in paging_init(), see below: > ----------------------------------------- > #if 0 > zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> > PAGE_SHIFT; > zones_size[ZONE_NORMAL] = 0; > #else > zones_size[ZONE_DMA] = (end_mem/2 - PAGE_OFFSET) >> > PAGE_SHIFT; > zones_size[ZONE_NORMAL] = (end_mem/2 - PAGE_OFFSET) >> > PAGE_SHIFT; > #endif > ----------------------------------------- > This is only what I did the change. I also suspect the zones are not > properly aligned, But how to align it? I think our system doesn't need > CONFIG_HOLES_IN_ZONE. That's right. I guess you can either align your zone sizes (must be aligned to MAX_ORDER size), or add the zone check in page_is_buddy. Hope that works. Nick -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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