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Sun, 13 Jul 2025 20:35:19 -0400 X-MC-Unique: u3M4V6djMSuLRS3lTcxq4w-1 X-Mimecast-MFC-AGG-ID: u3M4V6djMSuLRS3lTcxq4w_1752453315 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id CA6DE1801210; Mon, 14 Jul 2025 00:35:14 +0000 (UTC) Received: from h1.redhat.com (unknown [10.22.64.9]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id BB61030001A1; Mon, 14 Jul 2025 00:35:01 +0000 (UTC) From: Nico Pache To: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kirill.shutemov@linux.intel.com, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, hughd@google.com Subject: [PATCH v9 11/14] khugepaged: kick khugepaged for enabling none-PMD-sized mTHPs Date: Sun, 13 Jul 2025 18:32:04 -0600 Message-ID: <20250714003207.113275-12-npache@redhat.com> In-Reply-To: <20250714003207.113275-1-npache@redhat.com> References: <20250714003207.113275-1-npache@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" From: Baolin Wang When only non-PMD-sized mTHP is enabled (such as only 64K mTHP enabled), we should also allow kicking khugepaged to attempt scanning and collapsing 64K mTHP. Modify hugepage_pmd_enabled() to support mTHP collapse, and while we are at it, rename it to make the function name more clear. Signed-off-by: Baolin Wang Signed-off-by: Nico Pache --- mm/khugepaged.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 3772dc0d78ea..65cb8c58bbf8 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -430,7 +430,7 @@ static inline int collapse_test_exit_or_disable(struct = mm_struct *mm) test_bit(MMF_DISABLE_THP, &mm->flags); } =20 -static bool hugepage_pmd_enabled(void) +static bool hugepage_enabled(void) { /* * We cover the anon, shmem and the file-backed case here; file-backed @@ -442,11 +442,11 @@ static bool hugepage_pmd_enabled(void) if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && hugepage_global_enabled()) return true; - if (test_bit(PMD_ORDER, &huge_anon_orders_always)) + if (READ_ONCE(huge_anon_orders_always)) return true; - if (test_bit(PMD_ORDER, &huge_anon_orders_madvise)) + if (READ_ONCE(huge_anon_orders_madvise)) return true; - if (test_bit(PMD_ORDER, &huge_anon_orders_inherit) && + if (READ_ONCE(huge_anon_orders_inherit) && hugepage_global_enabled()) return true; if (IS_ENABLED(CONFIG_SHMEM) && shmem_hpage_pmd_enabled()) @@ -490,7 +490,7 @@ void khugepaged_enter_vma(struct vm_area_struct *vma, vm_flags_t vm_flags) { if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) && - hugepage_pmd_enabled()) { + hugepage_enabled()) { unsigned long orders =3D vma_is_anonymous(vma) ? THP_ORDERS_ALL_ANON : BIT(PMD_ORDER); =20 @@ -2714,7 +2714,7 @@ static unsigned int collapse_scan_mm_slot(unsigned in= t pages, int *result, =20 static int khugepaged_has_work(void) { - return !list_empty(&khugepaged_scan.mm_head) && hugepage_pmd_enabled(); + return !list_empty(&khugepaged_scan.mm_head) && hugepage_enabled(); } =20 static int khugepaged_wait_event(void) @@ -2787,7 +2787,7 @@ static void khugepaged_wait_work(void) return; } =20 - if (hugepage_pmd_enabled()) + if (hugepage_enabled()) wait_event_freezable(khugepaged_wait, khugepaged_wait_event()); } =20 @@ -2818,7 +2818,7 @@ static void set_recommended_min_free_kbytes(void) int nr_zones =3D 0; unsigned long recommended_min; =20 - if (!hugepage_pmd_enabled()) { + if (!hugepage_enabled()) { calculate_min_free_kbytes(); goto update_wmarks; } @@ -2868,7 +2868,7 @@ int start_stop_khugepaged(void) int err =3D 0; =20 mutex_lock(&khugepaged_mutex); - if (hugepage_pmd_enabled()) { + if (hugepage_enabled()) { if (!khugepaged_thread) khugepaged_thread =3D kthread_run(khugepaged, NULL, "khugepaged"); @@ -2894,7 +2894,7 @@ int start_stop_khugepaged(void) void khugepaged_min_free_kbytes_update(void) { mutex_lock(&khugepaged_mutex); - if (hugepage_pmd_enabled() && khugepaged_thread) + if (hugepage_enabled() && khugepaged_thread) set_recommended_min_free_kbytes(); mutex_unlock(&khugepaged_mutex); } --=20 2.50.0