From mboxrd@z Thu Jan 1 00:00:00 1970 From: hejianet@gmail.com (Jia He) Date: Mon, 7 May 2018 09:10:40 +0800 Subject: [PATCH v8 0/6] optimize memblock_next_valid_pfn and early_pfn_valid on arm and arm64 In-Reply-To: <23b14717-0f4a-10f2-5118-7cb8445fbdab@oracle.com> References: <1523431317-30612-1-git-send-email-hejianet@gmail.com> <05b0fcf2-7670-101e-d4ab-1f656ff6b02f@gmail.com> <23b14717-0f4a-10f2-5118-7cb8445fbdab@oracle.com> Message-ID: <448ad581-6635-e732-c49d-9240cdb385b5@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 5/5/2018 12:53 AM, Pavel Tatashin Wrote: >> I'm wondering, ain't simple enabling of config >> DEFERRED_STRUCT_PAGE_INIT provide even better speed-up? If that is the >> case then it seems like this series is not needed at all, right? >> I am not sure why is this config optional. It looks like it could be >> enabled by default or even unconditionally considering that with >> commit c9e97a1997fb ("mm: initialize pages on demand during boot") the >> deferred code is statically disabled after all the pages are >> initialized. > Hi Daniel, > > Currently, deferred struct pages are initialized in parallel only on NUMA machines. I would like to make a change to use all the available CPUs even on a single socket systems, but that is not there yet. So, I believe Jia's performance improvements are still relevant. Thanks for the information. I checked the config in my armv8a server, DEFERRED_STRUCT_PAGE_INIT has not been enabled yet.And my server is single socket. Cheers. Jia