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Wed, 10 Mar 2021 03:55:34 +0000 (GMT) From: "Kiwoong Kim" To: "'Ulf Hansson'" Cc: In-Reply-To: Subject: RE: About a possibility of long latency to claim host Date: Wed, 10 Mar 2021 12:55:33 +0900 Message-ID: <002301d71561$390997e0$ab1cc7a0$@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Content-Language: ko Thread-Index: AQHnYJw8NfxlhPim0I9Ql9ljwqb6fAGpovOjAi+Gw36qPTe/AA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrDKsWRmVeSWpSXmKPExsWy7bCmha65s0eCwZyX3BZH/vczWhxfG+7A 5HHn2h42j8+b5AKYonJsMlITU1KLFFLzkvNTMvPSbZW8g+Od403NDAx1DS0tzJUU8hJzU22V XHwCdN0yc4CmKymUJeaUAoUCEouLlfTtbIryS0tSFTLyi0tslVILUnIKDA0L9IoTc4tL89L1 kvNzrQwNDIxMgSoTcjK+3TnPWLCateLbjCesDYxzWLoYOTgkBEwk7j8K7WLk4hAS2MEocf7+ LWYI5xOjxMqGj0BFnEDOZ0aJvQdyQGyQhmOzXkIV7WKUWNX7kQ3CecEo0f2nkQmkik1AW2La w92sILaIgI7EjDfNYDazgLzE2ysrwGxOgUCJHSc/sIKcISxgJ7HubwRImEVAVeLMvAfsIDav gKXE2UcXWCBsQYmTM5+wwIzZ/nYOM8RBChI/ny6DGi8iMbuzjRlirZPE0pPrGUFukxA4xy6x q3cHK8TLLhJLFmtD9ApLvDq+hR3ClpJ42d8GZddL7JvawArR28Mo8XTfP0aIhLHErGftjCBz mAU0Jdbv0ocYqSxx5BbUaXwSHYf/skOEeSU62oQgGpUlfk2aDDVEUmLmzTvsExiVZiF5bBaS x2YheWYWwq4FjCyrGMVSC4pz01OLjQqMkGN6EyM42Wm57WCc8vaD3iFGJg7GQ4wSHMxKIrx+ x90ShHhTEiurUovy44tKc1KLDzGaAoN6IrOUaHI+MN3mlcQbmhqZmRlYmlqYmhlZKInzFhs8 iBcSSE8sSc1OTS1ILYLpY+LglGpg2vbzwNqJOREifptVTl3kSVPy6jn9gMkto/d95hP5eYf/ zZ25o9bwtbI817Uroa676jrjguxX8ydd86456PZnTsBToddJNUoK166+Ztgt2vB4oqG5fGrA kW33Gk3bHi9Z8eH0VvU7hzZNEOJcp/+BsW2iX52dh5BTccO3qFNtYTnMS7QrE/0nPuo8blKz mKXu3gFGbcsY6frqfdzzZ08/fXr175tv2ktP6G5w7e8trNq61zpL4GVDoqHMs087ZvLarL7g l7ImWO1ATrH5t8ZLz9KrvQRa1CPSn3IprJh0wdD1/gP21vlavD0b90zcfvBlsTXHu9pDjhtF 4pkWpAYzNGbZi8w/Pav+IqfV/aw3SizFGYmGWsxFxYkATdUY7v8DAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrFLMWRmVeSWpSXmKPExsWy7bCSvK6Zs0eCwdaFkhZH/vczWhxfG+7A 5HHn2h42j8+b5AKYorhsUlJzMstSi/TtErgyvt05z1iwmrXi24wnrA2Mc1i6GDk5JARMJI7N esncxcjFISSwg1Fi86vrUAlJiRM7nzNC2MIS91uOsEIUPWOUuL1iFTtIgk1AW2Law92sILaI gI7EjDfNYDazgLzE2ysroBouMEos33EcbBKnQKDEjpMfgBIcHMICdhLr/kaAhFkEVCXOzHsA NpNXwFLi7KMLLBC2oMTJmU9YIGZqS/Q+bGWEmb/97RxmiOMUJH4+XQa1V0RidmcbM8Q9ThJL T65nnMAoPAvJqFlIRs1CMmoWkvYFjCyrGCVTC4pz03OLDQuM8lLL9YoTc4tL89L1kvNzNzGC g19LawfjnlUf9A4xMnEwHmKU4GBWEuH1O+6WIMSbklhZlVqUH19UmpNafIhRmoNFSZz3QtfJ eCGB9MSS1OzU1ILUIpgsEwenVANT4BKXBKbQBolbzc2Wn4LfnzC3//f9hewOkSndd33k37u1 mHbcc3te1/eQhSfVmYubM3FWpEntFmWTmqZtscH+4m2XXOOey0x+OqG14AfjzvAPVQ5b5uTZ bj/yf16B+wHpGSH/o0rn7ebMberWDrebxLFQ9nBp1/1nF3uOSvbf5vn9dZeEyL2wBCuz9F9T stdNWmkhzy1eobfvB8u6ZPencUozlZ9bZuum3v7Ys2b2lN5+o41M3yYVVe4ubD500T9sRbyq 3tWYW5c/1j7VtWyt/BI8bULba547oWl2GXapzh7pOyf0JK4vvHNWLmGHdXGE7YUNtsZ2nobq l9/4nfZqC5BL/WWeOHXy2wVa35VYijMSDbWYi4oTARvQhu3tAgAA X-CMS-MailID: 20210310035534epcas2p42954ede9bbb60651f755174baec412f0 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20210309041059epcas2p49567b092c8d82bb80aa76ad26f8d212b References: <02da01d7149a$35dec530$a19c4f90$@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org > > Below is the call stacks shown after the symptom happened and the system > tried to enter into suspend again. > > In this case, mmc pm notifier is called with PM_SUSPEND_PREPARE, so it > waits for completion or cancelling the work for mmc_rescan. > > For the latency, mobile users can see black screen for a long time > sometimes, even with pushing a power button to wake up the system. > > I think I understand what you are saying, but please correct me if I am > wrong. > > The I/O requests keep flowing into the blk queue even after > PM_SUSPEND_PREPARE has been fired, thus preventing the earlier scheduled > mmc_rescan() from claiming the host? Correct.