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Tue, 7 Mar 2023 18:54:15 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B250B20043; Tue, 7 Mar 2023 18:54:15 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 23C5A20040; Tue, 7 Mar 2023 18:54:15 +0000 (GMT) Received: from p-imbrenda (unknown [9.179.29.172]) by smtpav04.fra02v.mail.ibm.com (Postfix) with SMTP; Tue, 7 Mar 2023 18:54:15 +0000 (GMT) Date: Tue, 7 Mar 2023 19:24:21 +0100 From: Claudio Imbrenda To: Cc: , , , , , , , Subject: Re: [PATCH v6 1/6] ksm: abstract the function try_to_get_old_rmap_item Message-ID: <20230307192421.30ab869c@p-imbrenda> In-Reply-To: <202302100916423431376@zte.com.cn> References: <202302100916423431376@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-GUID: VQcmfk-8XpoWKet4l_wQubSe0VGakhGw X-Proofpoint-ORIG-GUID: vbnfNrNwNVvBDS2BhWFoeVluqct5PeDB 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_14,2023-03-07_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 clxscore=1011 phishscore=0 suspectscore=0 impostorscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=749 malwarescore=0 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303070164 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 49AE64000E X-Stat-Signature: sjmpfbqofwgrnhr8r4yf3ca6gmr4mg37 X-Rspam-User: X-HE-Tag: 1678215262-525031 X-HE-Meta: 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 QlC1R06R lzGiDVrzUeyLUp4p0HBU6XywPD1jqi345VMO5eVn/9DJSH11Pfo0gBsM/UqUYDEueFYDbUzZUOfUzSShHW0qIT0yMsD9DJfiS8vcSV6qFNhNXkQI2+rPqQpgSbcSn78FsmtfS0Xe2bqGQhp5GFzd/IcBD3CQHitm0DquF4+K9cyBLGayPHlFW0fGE77N+J7+BnFgqZ9LvOYbo3qpkMOfXiFwCtBgmEIHZmeF/5h/yPvQi9q9+jsyNVpTrX2JjqOrIeeM/salArH6X4ueP6HzjrH0pEAb2/kas4CACUyNWEtkh3lx6tWVdzZJmbA0gu0JgeJeKHBpiPjKt4uRWg0f5iWA6U2eU4at0zZvBByL0eIKUVb+y6vZaZmCyCcmRrQzVBM22WuIamyHnlnAtB3rjLmtdew== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 09:16:42 +0800 (CST) wrote: > From: xu xin > > A new function try_to_get_old_rmap_item is abstracted from > get_next_rmap_item. This function will be reused by the subsequent > patches about counting ksm_zero_pages. > > The patch improves the readability and reusability of KSM code. > > Signed-off-by: xu xin > Cc: David Hildenbrand > Cc: Claudio Imbrenda > Cc: Xuexin Jiang > Reviewed-by: Xiaokai Ran > Reviewed-by: Yang Yang > > v5->v6: > Modify some comments according to David's suggestions. > --- > mm/ksm.c | 27 +++++++++++++++++++++------ > 1 file changed, 21 insertions(+), 6 deletions(-) > > diff --git a/mm/ksm.c b/mm/ksm.c > index 83e2f74ae7da..905a79d213da 100644 > --- a/mm/ksm.c > +++ b/mm/ksm.c > @@ -2214,23 +2214,38 @@ static void cmp_and_merge_page(struct page *page, struct ksm_rmap_item *rmap_ite > } > } > > -static struct ksm_rmap_item *get_next_rmap_item(struct ksm_mm_slot *mm_slot, > - struct ksm_rmap_item **rmap_list, > - unsigned long addr) > +static struct ksm_rmap_item *try_to_get_old_rmap_item(unsigned long addr, > + struct ksm_rmap_item **rmap_list) > { > - struct ksm_rmap_item *rmap_item; > - > while (*rmap_list) { > - rmap_item = *rmap_list; > + struct ksm_rmap_item *rmap_item = *rmap_list; why are you declaring this here? I think it's more clear if you declare the variable at the beginning of the function, like it was before > + > if ((rmap_item->address & PAGE_MASK) == addr) > return rmap_item; > if (rmap_item->address > addr) > break; > *rmap_list = rmap_item->rmap_list; > + /* > + * If we end up here, the VMA is MADV_UNMERGEABLE or its page > + * is ineligible or discarded, e.g. MADV_DONTNEED. > + */ > remove_rmap_item_from_tree(rmap_item); > free_rmap_item(rmap_item); > } > > + return NULL; > +} > + > +static struct ksm_rmap_item *get_next_rmap_item(struct ksm_mm_slot *mm_slot, > + struct ksm_rmap_item **rmap_list, > + unsigned long addr) > +{ > + struct ksm_rmap_item *rmap_item; > + > + rmap_item = try_to_get_old_rmap_item(addr, rmap_list); > + if (rmap_item) > + return rmap_item; > + > rmap_item = alloc_rmap_item(); > if (rmap_item) { > /* It has already been zeroed */