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Tue, 7 Mar 2023 18:54:26 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B636020043; Tue, 7 Mar 2023 18:54:26 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2E94820040; Tue, 7 Mar 2023 18:54:26 +0000 (GMT) Received: from p-imbrenda (unknown [9.179.29.172]) by smtpav04.fra02v.mail.ibm.com (Postfix) with SMTP; Tue, 7 Mar 2023 18:54:26 +0000 (GMT) Date: Tue, 7 Mar 2023 19:53:13 +0100 From: Claudio Imbrenda To: Cc: , , , , , , , Subject: Re: [PATCH v6 6/6] selftest: add testing unsharing and counting ksm zero page Message-ID: <20230307195313.2e21245a@p-imbrenda> In-Reply-To: <202302100921574141612@zte.com.cn> References: <202302100921574141612@zte.com.cn> Organization: IBM X-Mailer: Claws Mail 4.1.1 (GTK 3.24.35; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: kvpUDED9MjvBZKmEK_05C8Wt5bbNlwXS X-Proofpoint-GUID: Th0uJZ0gBlU7CEkZA-IIqI7cizQB622e X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-07_12,2023-03-07_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 malwarescore=0 bulkscore=0 clxscore=1015 mlxlogscore=538 impostorscore=0 spamscore=0 mlxscore=0 phishscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303070164 X-Rspamd-Queue-Id: 9B7C51C000E X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: q6ur7g8ydqdck37nts5651f56dtdj47n X-HE-Tag: 1678215273-766666 X-HE-Meta: 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 P+Gnd9gT c9ZeFtbL8Y36qPp+FC91OLcuSzLoqBqoG4kt6KSAzFK5oaQnVPVPeAJrqmsaVG3yyVx6KFhnCNXC/lrWbz6p+SH+OaE0IKccukWrgGitrUq0Gf9QnhWCjulG8pOKxSP1UnkWbuzBGoca5K9iHwrrY/0HZKA53jgjsuAvxE+UMHVTwuiTFH8UHXspu7gt0kOsAusXj5dvHzgDrLFCPEHQGdN7+RD6kjD1F2BNGaHezJvAF/4MxIqMsU6S7R+fbysmIUckk+KLTePfceSvmgkaD1TvQRxOLo903k6//t+5dghtKVHMSvk4Ybb0WxavQlgVfickadn4ejZV0cUak/QyqBEEQ6o4oqDtGrGif X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 10 Feb 2023 09:21:57 +0800 (CST) wrote: > From: xu xin > > Add a function test_unmerge_zero_page() to test the functionality on > unsharing and counting ksm-placed zero pages and counting of this patch > series. > > test_unmerge_zero_page() actually contains three subjct test objects: > 1) whether the count of ksm zero page can react correctly to cow > (copy on write); > 2) whether the count of ksm zero page can react correctly to unmerge; > 3) whether ksm zero pages are really unmerged. > > Signed-off-by: xu xin > Cc: Claudio Imbrenda > Cc: David Hildenbrand > Cc: Xuexin Jiang > Reviewed-by: Xiaokai Ran > Reviewed-by: Yang Yang [...] > +static int unmerge_zero_page(char *start, unsigned long size) > +{ > + int ret; > + > + ret = madvise(start, size, MADV_UNMERGEABLE); > + if (ret) { > + ksft_test_result_fail("MADV_UNMERGEABLE failed\n"); > + return ret; > + } > + > + /* > + * Wait for two full scans such that any possible unmerging of zero > + * pages happened. Why? Because the unmerge action of zero pages is not please remove "Why? Because" > + * done in the context of madvise(), but in the context of > + * unshare_zero_pages() of the ksmd thread. > + */ > + return wait_two_full_scans(); > +} > + > static char *mmap_and_merge_range(char val, unsigned long size) > { > char *map; [...]