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[2003:cb:c721:a000:7426:f6b4:82a3:c6ab]) by smtp.gmail.com with ESMTPSA id f9-20020a0560001b0900b0032196c508e3sm5072190wrz.53.2023.11.24.11.57.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Nov 2023 11:57:01 -0800 (PST) Message-ID: Date: Fri, 24 Nov 2023 20:56:59 +0100 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 15/27] arm64: mte: Check that tag storage blocks are in the same zone To: Alexandru Elisei , catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org References: <20231119165721.9849-1-alexandru.elisei@arm.com> <20231119165721.9849-16-alexandru.elisei@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 19.11.23 17:57, Alexandru Elisei wrote: > alloc_contig_range() requires that the requested pages are in the same > zone. Check that this is indeed the case before initializing the tag > storage blocks. > > Signed-off-by: Alexandru Elisei > --- > arch/arm64/kernel/mte_tag_storage.c | 33 +++++++++++++++++++++++++++++ > 1 file changed, 33 insertions(+) > > diff --git a/arch/arm64/kernel/mte_tag_storage.c b/arch/arm64/kernel/mte_tag_storage.c > index 8b9bedf7575d..fd63430d4dc0 100644 > --- a/arch/arm64/kernel/mte_tag_storage.c > +++ b/arch/arm64/kernel/mte_tag_storage.c > @@ -265,6 +265,35 @@ void __init mte_tag_storage_init(void) > } > } > > +/* alloc_contig_range() requires all pages to be in the same zone. */ > +static int __init mte_tag_storage_check_zone(void) > +{ > + struct range *tag_range; > + struct zone *zone; > + unsigned long pfn; > + u32 block_size; > + int i, j; > + > + for (i = 0; i < num_tag_regions; i++) { > + block_size = tag_regions[i].block_size; > + if (block_size == 1) > + continue; > + > + tag_range = &tag_regions[i].tag_range; > + for (pfn = tag_range->start; pfn <= tag_range->end; pfn += block_size) { > + zone = page_zone(pfn_to_page(pfn)); > + for (j = 1; j < block_size; j++) { > + if (page_zone(pfn_to_page(pfn + j)) != zone) { > + pr_err("Tag storage block pages in different zones"); > + return -EINVAL; > + } > + } > + } > + } > + > + return 0; > +} > + Looks like something that ordinary CMA provides. See cma_activate_area(). Can't we find a way to let CMA do CMA thingies and only be a user of that? What would be required to make the performance issue you spelled out in the cover letter be gone and not have to open-code that in arch code? -- Cheers, David / dhildenb