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Shutemov" To: Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel Cc: Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Dario Faggioli , Dave Hansen , Mike Rapoport , David Hildenbrand , Mel Gorman , marcelo.cerri@canonical.com, tim.gardner@canonical.com, khalid.elmously@canonical.com, philip.cox@canonical.com, aarcange@redhat.com, peterx@redhat.com, x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv9 04/14] mm/page_alloc: Add sysfs handle to accept accept_memory Date: Thu, 30 Mar 2023 14:49:46 +0300 Message-Id: <20230330114956.20342-5-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230330114956.20342-1-kirill.shutemov@linux.intel.com> References: <20230330114956.20342-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.4 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761793485832534572?= X-GMAIL-MSGID: =?utf-8?q?1761793485832534572?= Write amount of memory to accept into the new sysfs handle /sys/kernel/mm/page_alloc/accept_memory. Write 'all' to the handle to accept all memory in the system. It can be used to implement background memory accepting from userspace. It is also useful for debugging. Signed-off-by: Kirill A. Shutemov --- mm/page_alloc.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 509a93b7e5af..07e16e9b49c4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -7343,6 +7343,45 @@ static bool __free_unaccepted(struct page *page) return true; } +static ssize_t accept_memory_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned long to_accept = 0; + struct zone *zone; + char *retptr; + + if (sysfs_streq(buf, "all")) { + to_accept = ULONG_MAX; + } else { + to_accept = memparse(buf, &retptr); + + /* Get rid of trailing whitespace, including '\n' */ + retptr = skip_spaces(retptr); + + if (*retptr != 0 || to_accept == 0) + return -EINVAL; + } + + for_each_populated_zone(zone) { + while (try_to_accept_memory_one(zone)) { + if (to_accept <= PAGE_SIZE << MAX_ORDER) + return count; + + to_accept -= PAGE_SIZE << MAX_ORDER; + } + } + + return count; +} + +static struct kobj_attribute accept_memory_attr = __ATTR_WO(accept_memory); + +static struct attribute *page_alloc_attr[] = { + &accept_memory_attr.attr, + NULL +}; + #else static bool page_contains_unaccepted(struct page *page, unsigned int order) @@ -7366,3 +7405,28 @@ static bool __free_unaccepted(struct page *page) } #endif /* CONFIG_UNACCEPTED_MEMORY */ + +static const struct attribute_group page_alloc_attr_group = { +#ifdef CONFIG_UNACCEPTED_MEMORY + .attrs = page_alloc_attr, +#endif +}; + +static int __init page_alloc_init_sysfs(void) +{ + struct kobject *page_alloc_kobj; + int err; + + page_alloc_kobj = kobject_create_and_add("page_alloc", mm_kobj); + if (!page_alloc_kobj) + return -ENOMEM; + + err = sysfs_create_group(page_alloc_kobj, &page_alloc_attr_group); + if (err) { + kobject_put(page_alloc_kobj); + return err; + } + + return 0; +} +late_initcall(page_alloc_init_sysfs);