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AJvYcCUpBMy7zXv+QeINrVzCeiRfzqdSpRNny6VxoHuXiEvX7a5At+19erLDmRvG9nmshsAvFHpLO99+gB6Fy302MTk=@vger.kernel.org X-Gm-Message-State: AOJu0YxWC30ouVEMHIBYcOj8pRhRksd5m61fTKMaRdjhia6D/8T7eJxJ m5URO9UQIiNuomalR192Mrqq7jJq8zmjmSxAmg+VGZwrPRKnUQQCw7Ib9SrAJIuvfHe35ui48mT OcG8+4AY1EluVkeukn8u8rw== X-Google-Smtp-Source: AGHT+IH+P75b7qdmkP6eoZLmeGyUgGCW8nOF1XpFIdx3c0B8s35iOw3gNUn1NvFFrnEnCdwtnZF761N+oNC8hfEQ5Q== X-Received: from ackerleytng-ctop.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:13f8]) (user=ackerleytng job=sendgmr) by 2002:a17:902:c40f:b0:205:4d27:6164 with SMTP id d9443c01a7336-2074c5e71f2mr248205ad.5.1726011876473; Tue, 10 Sep 2024 16:44:36 -0700 (PDT) Date: Tue, 10 Sep 2024 23:43:33 +0000 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.46.0.598.g6f2099f65c-goog Message-ID: <416274da1bb0f07db37944578f9e7d96dac3873c.1726009989.git.ackerleytng@google.com> Subject: [RFC PATCH 02/39] mm: hugetlb: Refactor vma_has_reserves() to should_use_hstate_resv() From: Ackerley Tng To: tabba@google.com, quic_eberman@quicinc.com, roypat@amazon.co.uk, jgg@nvidia.com, peterx@redhat.com, david@redhat.com, rientjes@google.com, fvdl@google.com, jthoughton@google.com, seanjc@google.com, pbonzini@redhat.com, zhiquan1.li@intel.com, fan.du@intel.com, jun.miao@intel.com, isaku.yamahata@intel.com, muchun.song@linux.dev, mike.kravetz@oracle.com Cc: erdemaktas@google.com, vannapurve@google.com, ackerleytng@google.com, qperret@google.com, jhubbard@nvidia.com, willy@infradead.org, shuah@kernel.org, brauner@kernel.org, bfoster@redhat.com, kent.overstreet@linux.dev, pvorel@suse.cz, rppt@kernel.org, richard.weiyang@gmail.com, anup@brainfault.org, haibo1.xu@intel.com, ajones@ventanamicro.com, vkuznets@redhat.com, maciej.wieczor-retman@intel.com, pgonda@google.com, oliver.upton@linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-fsdevel@kvack.org With the addition of the chg parameter, vma_has_reserves() no longer just determines whether the vma has reserves. The comment in the vma->vm_flags & VM_NORESERVE block indicates that this function actually computes whether or not the reserved count should be decremented. This refactoring also takes into account the allocation's request parameter avoid_reserve, which helps to further simplify the calling function alloc_hugetlb_folio(). Signed-off-by: Ackerley Tng --- mm/hugetlb.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index af5c6bbc9ff0..597102ed224b 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1245,9 +1245,19 @@ void clear_vma_resv_huge_pages(struct vm_area_struct *vma) hugetlb_dup_vma_private(vma); } -/* Returns true if the VMA has associated reserve pages */ -static bool vma_has_reserves(struct vm_area_struct *vma, long chg) +/* + * Returns true if this allocation should use (debit) hstate reservations, based on + * + * @vma: VMA config + * @chg: Whether the page requirement can be satisfied using subpool reservations + * @avoid_reserve: Whether allocation was requested to avoid using reservations + */ +static bool should_use_hstate_resv(struct vm_area_struct *vma, long chg, + bool avoid_reserve) { + if (avoid_reserve) + return false; + if (vma->vm_flags & VM_NORESERVE) { /* * This address is already reserved by other process(chg == 0), @@ -3182,7 +3192,7 @@ struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma, if (ret) goto out_uncharge_cgroup_reservation; - use_hstate_resv = !avoid_reserve && vma_has_reserves(vma, gbl_chg); + use_hstate_resv = should_use_hstate_resv(vma, gbl_chg, avoid_reserve); spin_lock_irq(&hugetlb_lock); folio = dequeue_hugetlb_folio_vma(h, vma, addr, use_hstate_resv);