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[2003:cb:c70c:1e00:4443:eaa9:9f5d:1497]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-378956e8674sm11196928f8f.115.2024.09.11.02.36.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Sep 2024 02:36:35 -0700 (PDT) Message-ID: <783a0d91-2910-4446-a979-c681dde402ec@redhat.com> Date: Wed, 11 Sep 2024 11:36:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] mm: Allocate THP on hugezeropage wp-fault To: Dev Jain , akpm@linux-foundation.org, willy@infradead.org, kirill.shutemov@linux.intel.com Cc: ryan.roberts@arm.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, cl@gentwo.org, vbabka@suse.cz, mhocko@suse.com, apopple@nvidia.com, dave.hansen@linux.intel.com, will@kernel.org, baohua@kernel.org, jack@suse.cz, mark.rutland@arm.com, hughd@google.com, aneesh.kumar@kernel.org, yang@os.amperecomputing.com, peterx@redhat.com, ioworker0@gmail.com, jglisse@google.com, wangkefeng.wang@huawei.com, ziy@nvidia.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20240911065600.1002644-1-dev.jain@arm.com> <20240911065600.1002644-3-dev.jain@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 50CF4A000A X-Stat-Signature: xhanjxde9m6tng79pxfkyr7yrbea3qqs X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1726047399-322632 X-HE-Meta: U2FsdGVkX18E7isXWYNGY0ItS7APG2EOMIcmLFLQt8jHDHWUJkxwJ5zz0BJdQ5pYMTRMnY6Hr12NpKS4Tf8ZSgv2RE0TF1haLxxKBkMhcg3KEDbik11FtmZmWaLmz1pJcI+hG2o2vFY/xwENNav2ZvlbOrVzTgbXK1Top39JTQemPZVYmNy5l7vc8dMpM/N/yIFSLz17BJFrO3n20cMuYAQIzfvmvrmHYET1mlMRW7o1w6gxz4VTQDxXoCXIiYbp8JeFYRZEeAtl0Gfm3WuTEPZAr6l2wauFB3SPUfuc5IcbM7ML7vwocrEq1avZ9C/rGPHj1tm++MWHLECpKqRRGzazRbTCbIDLAl0joPEx8INHLn4lAPjkyA658p5Ad+qR8M9Ph0Fvx34Zlx3F8rawYyJkn+mkmrIywvrZyAh0mPwzs5Ymvz5B36dnJhIulvCW2CpoRN+eAFW47wdkCseM5kHaALXaXIYqOTD9PvznL0OsWjVv5/eU6T7e+sgmtbtYdIvN3oBh3Jtt2uBoB1YRQ8+LFSTc+I7doLb/+ZVmp+gnf2m4QzPiSymAEkdahKgkFy1SYDEo7CXK4mMkEL62Y0S5MxWzEhtrJU+KJzJwoTigRQptzx/5MbsUP+0WOY6mw19lf1U0RvPwGp9kMKeWn2UzdxqOPfobyZXPVtyUUjL8WkLqPcqKebBt0yqHv7Cz3k5RzOZhdSVmgvgtSCktX6k1YxNa9lNB0k8VnLIVrfJvK7cXukKYjeHn1Iw93ig7xOdRlv4gfl8Ch/YQbwzIJge7xbYl6ikrMHPjFItMvweqedo2F2suRU4syjgcQKA7WKHzLsD9L40zGd+V9L4Bo2/EpvU6EuOW22e32fK+Ghmboc64auytv06N0ejo8dXJSN+TEAnC6MuDiotGcMv493vAkFIOE67mU4OedZar3vZdhWNhF/TN6+UFOmMHfMuXvcchPffSao0xEb+GoH+ YBd/nBTl CX/c2EOqOs1QUrqS2UKkKd1LN5AOleypZ0E62y6A7HgPNdeBdZznMxgeFqIJr4towGusWxXpS4+P/YixgbWPyv4b3PfhxsU9c0b7OleMDAmU49JfIYY+Vnp++ACR8Hm8x9DU28uShThuH3Q6btcJ7Mvu0bd4cY0YJBiIip5ilh+UIx55DzQ0b77J0DI2dOaOJwL14x0yt5MABH6kc/NCPT9YXjybnBwrB7/HI6U+NNmmtoyUOPspDzdPkL4IqvWv/ha6x4lleDV4DCOnQdFi6AbUcs/Y3d17JwhK+dt0yjMfxMeC34TE0CKPf3yEavJHJgNtB1vH3dXcFODw5bV3Z6ih4kyd5qJFJm4AASdPE0HMkmBAsFmsyfs+GUqbKVtUpGTIVL0VUkWvKqoRieqwV1HkrRoy1q+LniPQ7q+rV/+ukt0R//XX4Syjywl+RKveCXAYGGew3oURERE8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11.09.24 08:56, Dev Jain wrote: > Introduce do_huge_zero_wp_pmd() to handle wp-fault on a hugezeropage and > replace it with a PMD-mapped THP. Change the helper introduced in the > previous patch to flush TLB entry corresponding to the hugezeropage. > In case of failure, fallback to splitting the PMD. > > Signed-off-by: Dev Jain > --- > mm/huge_memory.c | 52 +++++++++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 49 insertions(+), 3 deletions(-) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index b96a1ff2bf40..3e28946a805f 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -987,16 +987,20 @@ static void __pmd_thp_fault_success_stats(struct vm_area_struct *vma) > static void map_pmd_thp(struct folio *folio, struct vm_fault *vmf, > struct vm_area_struct *vma, unsigned long haddr) > { > - pmd_t entry; > + pmd_t entry, old_pmd; > + bool is_pmd_none = pmd_none(*vmf->pmd); > > entry = mk_huge_pmd(&folio->page, vma->vm_page_prot); > entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma); > folio_add_new_anon_rmap(folio, vma, haddr, RMAP_EXCLUSIVE); > folio_add_lru_vma(folio, vma); > + if (!is_pmd_none) > + old_pmd = pmdp_huge_clear_flush(vma, haddr, vmf->pmd); This should likely be done in the caller. > set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry); > update_mmu_cache_pmd(vma, vmf->address, vmf->pmd); > add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR); > - mm_inc_nr_ptes(vma->vm_mm); > + if (is_pmd_none) > + mm_inc_nr_ptes(vma->vm_mm); And this as well. No need to make this function deal with this if the callers exactly know what they are doing. > } > > static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf) > @@ -1576,6 +1580,41 @@ void huge_pmd_set_accessed(struct vm_fault *vmf) > spin_unlock(vmf->ptl); > } > > +static vm_fault_t do_huge_zero_wp_pmd(struct vm_fault *vmf, unsigned long haddr) Is there a need to pass in "haddr" if we have the vmf? > +{ > + struct vm_area_struct *vma = vmf->vma; > + gfp_t gfp = vma_thp_gfp_mask(vma); > + struct mmu_notifier_range range; > + struct folio *folio; > + vm_fault_t ret = 0; > + > + folio = pmd_thp_fault_alloc(gfp, vma, haddr, vmf->address); > + if (unlikely(!folio)) { > + ret = VM_FAULT_FALLBACK; > + goto out; > + } > + > + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm, haddr, > + haddr + HPAGE_PMD_SIZE); > + mmu_notifier_invalidate_range_start(&range); > + vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); > + if (unlikely(!pmd_same(pmdp_get(vmf->pmd), vmf->orig_pmd))) > + goto release; > + ret = check_stable_address_space(vma->vm_mm); > + if (ret) > + goto release; The clear+flush really belongs here. > + map_pmd_thp(folio, vmf, vma, haddr); > + __pmd_thp_fault_success_stats(vma); > + goto unlock; > +release: > + folio_put(folio); > +unlock: > + spin_unlock(vmf->ptl); > + mmu_notifier_invalidate_range_end(&range); > +out: > + return ret; > +} > + -- Cheers, David / dhildenb