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Message-ID: <e05d99f4b8b8719f99e1de44dc26e94c9994c34b.camel@intel.com> Date: Tue, 29 Mar 2022 21:36:09 +0000 From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com> To: "songliubraving@...com" <songliubraving@...com> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "daniel@...earbox.net" <daniel@...earbox.net>, "peterz@...radead.org" <peterz@...radead.org>, "ast@...nel.org" <ast@...nel.org>, "bpf@...r.kernel.org" <bpf@...r.kernel.org>, "Kernel-team@...com" <Kernel-team@...com>, "song@...nel.org" <song@...nel.org>, "hch@....de" <hch@....de>, "pmenzel@...gen.mpg.de" <pmenzel@...gen.mpg.de>, "andrii@...nel.org" <andrii@...nel.org>, "x86@...nel.org" <x86@...nel.org>, "iii@...ux.ibm.com" <iii@...ux.ibm.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "urezki@...il.com" <urezki@...il.com>, "npiggin@...il.com" <npiggin@...il.com> Subject: Re: [PATCH v9 bpf-next 1/9] x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP On Tue, 2022-03-29 at 19:13 +0000, Song Liu wrote: > > > > I don't think we should tie this to vmap_allow_huge by definition. > > Also, what it does is try 2MB pages for allocations larger than > > 2MB. > > For smaller allocations it doesn't try or "prefer" them. > > How about something like: > > #define VM_TRY_HUGE_VMAP 0x00001000 /* try PMD_SIZE > mapping if size-per-node >= PMD_SIZE */ Seems reasonable name. I don't know if "size-per-node >= PMD_SIZE" is going to be useful information. Maybe something like: /* Allow for huge pages on HAVE_ARCH_HUGE_VMALLOC_FLAG arch's */
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