* arm64: why set SECTION_SIZE_BITS to 1G size? @ 2016-08-11 9:44 Xishi Qiu 2016-08-11 10:07 ` Catalin Marinas 0 siblings, 1 reply; 2+ messages in thread From: Xishi Qiu @ 2016-08-11 9:44 UTC (permalink / raw) To: Catalin Marinas, Will Deacon; +Cc: Linux MM, LKML, chenjie6 Hi everyone: arm64: SECTION_SIZE_BITS 30 -----1G The memory hotplug(add_memory -->check_hotplug_memory_range) must be aligned with section.So I can not add mem with 64M ... Can I modify the SECTION_SIZE_BITS to 26? Thanks, Xishi Qiu -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: arm64: why set SECTION_SIZE_BITS to 1G size? 2016-08-11 9:44 arm64: why set SECTION_SIZE_BITS to 1G size? Xishi Qiu @ 2016-08-11 10:07 ` Catalin Marinas 0 siblings, 0 replies; 2+ messages in thread From: Catalin Marinas @ 2016-08-11 10:07 UTC (permalink / raw) To: Xishi Qiu; +Cc: Will Deacon, Linux MM, LKML, chenjie6 On Thu, Aug 11, 2016 at 05:44:46PM +0800, Xishi Qiu wrote: > arm64: > SECTION_SIZE_BITS 30 -----1G > > The memory hotplug(add_memory -->check_hotplug_memory_range) > must be aligned with section.So I can not add mem with 64M ... > Can I modify the SECTION_SIZE_BITS to 26? There was a patch to reduce this to 27: http://lkml.kernel.org/g/1465821119-3384-1-git-send-email-jszhang@marvell.com Also some discussions in this thread on a different patch: http://lkml.iu.edu/hypermail/linux/kernel/1604.1/03036.html Does your system really have such small alignment memory blocks? -- Catalin -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2016-08-11 10:07 UTC | newest] Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2016-08-11 9:44 arm64: why set SECTION_SIZE_BITS to 1G size? Xishi Qiu 2016-08-11 10:07 ` Catalin Marinas
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