From: Yinghai <yinghai.lu@oracle.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
David Miller <davem@davemloft.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH 18/39] lmb: Add lmb_reserve_area_overlap_ok()
Date: Mon, 12 Apr 2010 22:37:58 -0700 [thread overview]
Message-ID: <4BC40336.4030902@oracle.com> (raw)
In-Reply-To: <1271135450.13059.72.camel@pasglop>
On 04/12/2010 10:10 PM, Benjamin Herrenschmidt wrote:
> On Mon, 2010-04-12 at 21:44 -0700, Yinghai wrote:
>
>> that is only for some special cases about area that is reserved for fw region.
>
> And ? From what I can see in the code, it will still not work properly
> unless all your special cases end up fitting right with the bug you
> effectively have..
not sure.
noticed there some overlapped, and with this patch, those overlapped area disappeared
>
>> and even there is overlapped area, it the code still can go through when lmb_to_bootmem or create range list for slab.
>> because they are using range array subtract.
>
> Well, either we just have overlapped areas or we don't ... we shouldn't
> have some kind of overlap_ok() thing that does the right thing ..
> sometimes, but maybe not, but we don't care anyways, which is what you
> seem to be saying.
yes.
>
>>> Besides, lmb_reserve_area_overlap_ok() sucks as a name :-)
>>
>> any suggestion for better name?
>
> Well, what you actually implemented is
>
> lmb_reserve_area_overlap_maybe_ok_not_too_sure_though()
>
> What we should decide is once for all, is it ok to have lmb_reserve() be
> called for overlapping ranges. I think the answer is yes and in fact, we
> don't take special care in powerpc either there so overlap could happen
> in theory.
>
> Now, do we want to avoid actually creating overlapping regions in the
> array ? I think we should look into it, but then we should fix
> lmb_reserve() to do the right thing here and coalesce all the overlaps.
not sure if is needed. lmb_free/lmb_reserve seems work.
YH
next prev parent reply other threads:[~2010-04-13 5:37 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-09 6:03 [PATCH -v12 00/39] use lmb with x86 Yinghai Lu
2010-04-09 6:03 ` [PATCH 01/39] swiotlb: Use page alignment for early buffer allocation Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 02/39] x86: Add sanitize_e820_map() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 03/39] x86: Align e820 ram range to page Yinghai Lu
2010-04-09 6:03 ` [PATCH 04/39] lmb: Move lmb.c to mm/ Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-13 3:52 ` Benjamin Herrenschmidt
2010-04-09 6:03 ` [PATCH 05/39] lmb: Seperate region array from lmb_region struct Yinghai Lu
2010-04-13 3:56 ` Benjamin Herrenschmidt
2010-04-09 6:03 ` [PATCH 06/39] lmb: Seperate __lmb_find_base() from __lmb_alloc_base() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-13 3:58 ` Benjamin Herrenschmidt
2010-04-13 4:31 ` Yinghai
2010-04-09 6:03 ` [PATCH 07/39] lmb: Add lmb_find_area() Yinghai Lu
2010-04-13 4:05 ` Benjamin Herrenschmidt
2010-04-13 4:29 ` Yinghai
2010-04-13 5:07 ` Benjamin Herrenschmidt
2010-04-13 5:26 ` Yinghai
2010-04-13 5:46 ` H. Peter Anvin
2010-04-13 10:15 ` Benjamin Herrenschmidt
2010-04-09 6:03 ` [PATCH 08/39] lmb: Add lmb_reserve_area/lmb_free_area Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-13 4:15 ` Benjamin Herrenschmidt
2010-04-09 6:03 ` [PATCH 09/39] bootmem, x86: Add weak version of reserve_bootmem_generic Yinghai Lu
2010-04-09 6:03 ` [PATCH 10/39] lmb: Add lmb_to_bootmem() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 11/39] lmb: Add get_free_all_memory_range() Yinghai Lu
2010-04-09 6:03 ` [PATCH 12/39] lmb: Add lmb_register_active_regions() and lmb_hole_size() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 13/39] lmb: Prepare to include linux/lmb.h in core file Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 14/39] lmb: Add find_memory_core_early() Yinghai Lu
2010-04-09 6:03 ` [PATCH 15/39] lmb: Add lmb_find_area_node() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-13 4:18 ` Benjamin Herrenschmidt
2010-04-13 4:37 ` Yinghai
2010-04-09 6:03 ` [PATCH 16/39] lmb: Add lmb_free_memory_size() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 17/39] lmb: Add lmb_memory_size() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 18/39] lmb: Add lmb_reserve_area_overlap_ok() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-13 4:21 ` Benjamin Herrenschmidt
2010-04-13 4:44 ` Yinghai
2010-04-13 5:10 ` Benjamin Herrenschmidt
2010-04-13 5:37 ` Yinghai [this message]
2010-04-13 5:37 ` Yinghai
2010-04-09 6:03 ` [PATCH 19/39] lmb: Use lmb_debug to control debug message print out Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 20/39] lmb: Add ARCH_DISCARD_LMB to put lmb code to .init Yinghai Lu
2010-04-09 6:03 ` [PATCH 21/39] lmb: Add __free/__reserve/__clear_lmb_reserved_region_array() Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 22/39] x86, lmb: Add lmb_find_area_size() Yinghai Lu
2010-04-09 6:03 ` [PATCH 23/39] x86, lmb: Add x86 version of __lmb_find_area() Yinghai Lu
2010-04-09 6:03 ` [PATCH 24/39] x86: Use lmb to replace early_res Yinghai Lu
2010-04-09 6:03 ` [PATCH 25/39] x86: Replace e820_/_early string with lmb_ Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 26/39] nobootmem: use lmb.default_alloc_limit in alloc_bootmem path Yinghai Lu
2010-04-13 4:23 ` Benjamin Herrenschmidt
2010-04-13 4:50 ` Yinghai
2010-04-13 5:13 ` Benjamin Herrenschmidt
2010-04-13 5:42 ` Yinghai
2010-04-09 6:03 ` [PATCH 27/39] x86, lmb: turn off ARCH_LMB_FIND_AREA Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 28/39] x86: Remove not used early_res code Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 29/39] x86, lmb: Use lmb_memory_size()/lmb_free_memory_size() to get correct dma_reserve Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:03 ` [PATCH 30/39] x86: put 64 bit numa node memmap above 16M Yinghai Lu
2010-04-09 6:03 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 31/39] x86: Use wake_system_ram_range() instead of e820_any_mapped() in agp path Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 32/39] x86: Add get_centaur_ram_top() Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 33/39] x86: Change e820_any_mapped() to __init Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 34/39] x86: Use walk_system_ream_range() instead of referring e820.map directly for tboot Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 35/39] x86: make e820 to be __initdata Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 36/39] bootmem: Add nobootmem.c to reduce the #ifdef Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 37/39] mm: move contig_page_data define to bootmem.c/nobootmem.c Yinghai Lu
2010-04-09 6:04 ` [PATCH 38/39] lmb: move __alloc_memory_core_early() to nobootmem.c Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-09 6:04 ` [PATCH 39/39] x86: have nobootmem version setup_bootmem_allocator() Yinghai Lu
2010-04-09 6:04 ` Yinghai Lu
2010-04-13 3:41 ` [PATCH -v12 00/39] use lmb with x86 Benjamin Herrenschmidt
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