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Date: Wed, 10 Mar 2010 15:05:47 -0800 From: Yinghai Lu <yinghai@...nel.org> To: David Miller <davem@...emloft.net> CC: mingo@...e.hu, tglx@...utronix.de, hpa@...or.com, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org Subject: Re: [RFC PATCH 6/6] sparc64: use early_res and nobootmem On 03/10/2010 02:49 PM, David Miller wrote: > From: Yinghai Lu <yinghai@...nel.org> > Date: Wed, 10 Mar 2010 14:20:18 -0800 > >> On 03/10/2010 02:04 PM, David Miller wrote: >>> From: Yinghai Lu <yinghai@...nel.org> >>> Date: Wed, 10 Mar 2010 13:24:27 -0800 >>> >>>> use early_res/fw_memmap to replace lmb, so could use early_res replace bootme >>>> later. >>>> >>>> Signed-off-by: Yinghai Lu <yinghai@...nel.org> >>> >>> This doesn't boot, it looks like early_res is not initialized >>> early enough, the backtrace is: >>> >>> [ 0.000000] Remapping the kernel... done. >>> [ 0.000000] Kernel panic - not syncing: can not find more space for early_res array >>> [ 0.000000] Call Trace: >>> [ 0.000000] [0000000000882c48] __check_and_double_early_res+0xc0/0x1c8 >>> [ 0.000000] [0000000000882f18] reserve_early+0x10/0x38 >>> [ 0.000000] [000000000087b894] prom_early_alloc+0x48/0x7c >>> [ 0.000000] [000000000087b3e4] get_one_property+0x28/0x50 >>> [ 0.000000] [000000000087b588] prom_create_node+0x44/0xe8 >>> [ 0.000000] [000000000087b6d0] prom_build_tree+0x1c/0xac >>> [ 0.000000] [000000000087b7b4] prom_build_devicetree+0x54/0x80 >>> [ 0.000000] [000000000087fd34] paging_init+0x69c/0x1268 >>> [ 0.000000] [00000000008786f4] start_kernel+0x88/0x374 >>> [ 0.000000] [000000000070589c] tlb_fixup_done+0x98/0xa0 >>> [ 0.000000] [0000000000000000] (null) >> >> looks like we need to increase MAX_EARLY_RES_X in kernel/early_res.c > > Ummm, hoestly, how do you know? > > Is there a debugging statement that triggered and printed a message > above which told you this? No, nothing like that happened. > > The truth is you have no idea whatsoever because early_res has been > written in a way that errors are hard to diagnose. > > It's definitely not a size issue, there are only 4 ranges that exist > in this machine. > > I don't know what the actual problem is and I don't have time to debug > it right now, please try to figure it out and send me patches to try. > > Actually that points out another regression of early_res, it lacks a > "xxx=debug" command line option like LMB does, which would have > allowed me to debug this very easily. > > Also, there are other problems with your changes. > > For example, the transformation you make in > arch/sparc/mm/init_64.c:alloc_node_data() is absolutely not > equivalent. > > NUMA nodes can have memory in discontiguous regions, the LMB node > based allocator gets it right, whereas your code could allocate memory > on the wrong node. > > Only the "nid_range()" callback passed to lmb_alloc_nid() is able to > determine nodes properly. > > This is yet another regression of your early_res code. > > The more and more I look at the early_res code the more I see > that: > > 1) LMB could do everything early_res does > > 2) early_res cannot do everything LMB can > > Can you seriously start looking at using LMB instead of this new > stuff which seems at every element to be a step backwards? ok. let's if we can make x86 to use lmb. Thanks Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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