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[2003:cb:c70d:f700:24cd:855:1c60:1ff4]) by smtp.gmail.com with ESMTPSA id e21-20020a05600c219500b003f50876905dsm1544885wme.6.2023.05.24.01.27.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 May 2023 01:27:48 -0700 (PDT) Message-ID: Date: Wed, 24 May 2023 10:27:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v9 2/5] ksm: count all zero pages placed by KSM Content-Language: en-US To: xu xin Cc: akpm@linux-foundation.org, imbrenda@linux.ibm.com, jiang.xuexin@zte.com.cn, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ran.xiaokai@zte.com.cn, xu.xin16@zte.com.cn, yang.yang29@zte.com.cn References: <52bfd744-3086-a22a-e2e7-8b64d5fccfcc@redhat.com> <20230524075539.20844-1-xu.xin16@zte.com.cn> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230524075539.20844-1-xu.xin16@zte.com.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham 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 On 24.05.23 09:55, xu xin wrote: >>> +extern unsigned long ksm_zero_pages; >>> + >>> +static inline void ksm_notify_unmap_zero_page(pte_t pte) >>> +{ >>> + if (is_ksm_zero_pte(pte)) >>> + ksm_zero_pages--; >>> +} >>> + >>> static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) >>> { >>> int ret; >>> @@ -103,6 +111,10 @@ static inline void ksm_exit(struct mm_struct *mm) >>> >>> #define is_ksm_zero_pte(pte) 0 >>> >>> +static inline void ksm_notify_unmap_zero_page(pte_t pte) >>> +{ >>> +} >>> + >> >> Having proposed that name ... I realize that we call this function >> whenever there might be a zeropage mapped (when we have !page after >> vm_normal_page()) -- but it could also not be the zeropage. >> >> Not really able to come up with a better name :) >> >> ksm_notify_maybe_unmap_zero_page ? >> >> ksm_maybe_unmap_zero_page ? >> > > Analogous to the existing name of ksm_might_need_to_copy, so maybe we can use > 'ksm_might_unmap_zero_page', Yes, that should work :) -- Thanks, David / dhildenb