From: Wei Yang <richardw.yang@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richardw.yang@linux.intel.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.or
Subject: Re: [PATCH 4/6] x86, mm: make split_mem_range() more easy to read
Date: Fri, 12 Apr 2019 11:08:18 +0800 [thread overview]
Message-ID: <20190412030818.GA29324@richard> (raw)
In-Reply-To: <alpine.DEB.2.21.1903232345500.1798@nanos.tec.linutronix.de>
On Sun, Mar 24, 2019 at 03:29:04PM +0100, Thomas Gleixner wrote:
>Find a mostly untested patch which implements this below. I just booted it
>in a 64bit guest and it did not explode.
>
>It removes 55 lines of code instead of adding 35 and reduces the binary
>size by 408 bytes on 64bit and 128 bytes on 32bit.
>
>Note, it's a combo of changes (including your patch 1/6) and needs to be
>split up. It would be nice if you have time to split it up into separate
>patches, add proper changelogs and test the heck out of it on both 32 and
>64 bit. If you don't have time, please let me know.
I tried to test mem hotplug with this applied.
On x86_64, this looks good. It split ranges well. While I found some problem
on testing mem hotplug on x86_32.
I start up a guest memory and trying to plug 1G memory.
The original memory split range looks good:
[ 0.004260] ywtest: [mem 0x00000000-0x00100000]
[ 0.004261] ywtest: [mem 0x00000000-0x000fffff] page size 4k
[ 0.004268] ywtest: [mem 0x37200000-0x37400000]
[ 0.004269] ywtest: [mem 0x37200000-0x373fffff] page size 2M
[ 0.004271] ywtest: [mem 0x20000000-0x37200000]
[ 0.004272] ywtest: [mem 0x20000000-0x371fffff] page size 2M
[ 0.004280] ywtest: [mem 0x00100000-0x20000000]
[ 0.004281] ywtest: [mem 0x00100000-0x001fffff] page size 4k
[ 0.004281] ywtest: [mem 0x00200000-0x1fffffff] page size 2M
[ 0.004292] ywtest: [mem 0x37400000-0x375fe000]
[ 0.004293] ywtest: [mem 0x37400000-0x375fdfff] page size 4k
While I can't online the new added memory device. And the new memory device's
range is out of 4G, which is a little bit strange.
>
>Thanks,
>
> tglx
>
--
Wei Yang
Help you, Help me
next prev parent reply other threads:[~2019-04-12 3:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-12 2:12 [PATCH 0/6] x86, mm: refine split_mem_range a little Wei Yang
2019-02-12 2:12 ` [PATCH 1/6] x86, mm: remove second argument of split_mem_range() Wei Yang
2019-03-24 14:38 ` Thomas Gleixner
2019-03-25 1:16 ` Wei Yang
2019-02-12 2:12 ` [PATCH 2/6] x86, mm: remove check in save_mr Wei Yang
2019-02-12 2:12 ` [PATCH 3/6] x86, mm: add comment for split_mem_range to help understanding Wei Yang
2019-02-12 2:12 ` [PATCH 4/6] x86, mm: make split_mem_range() more easy to read Wei Yang
2019-03-24 14:29 ` Thomas Gleixner
2019-03-27 22:05 ` Wei Yang
2019-03-28 0:16 ` Thomas Gleixner
2019-03-28 0:25 ` Wei Yang
2019-03-28 3:35 ` Wei Yang
2019-03-28 7:20 ` Wei Yang
2019-03-28 8:08 ` Thomas Gleixner
2019-03-29 3:38 ` Wei Yang
[not found] ` <20190328065117.GA6202@richard>
2019-03-28 8:02 ` Thomas Gleixner
2019-04-12 3:08 ` Wei Yang [this message]
2019-02-12 2:12 ` [PATCH 5/6] x86, mm: skip 1G range if the range doesn't span PUD Wei Yang
2019-02-12 2:12 ` [PATCH 6/6] x86, mm: x86, mm: jump to split only 4K range when range doesn't span PMD Wei Yang
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