Messages in this thread | | | From | chengzhihao <> | Subject | 答复: 答复: [PATCH RFC] ubi: ubi wl get p eb: Replace a limited number of attempts with polling while getting PEB | Date | Thu, 1 Aug 2019 09:26:34 +0000 |
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> You send this patch three times, I guess your mail setup has issues? :-) Sorry, I thought I hadn't sent the first two e-mails. (The Patch work website refreshes slowly)
> Do you have numbers how many attempts were needed to get a free block? I tested it dozens of times. The biggest number of attempts I've ever had so far is 6. In most cases, it only takes 2 or 3 times.
-----邮件原件----- 发件人: Richard Weinberger [mailto:richard@nod.at] 发送时间: 2019年8月1日 17:21 收件人: chengzhihao <chengzhihao1@huawei.com> 抄送: zhangyi (F) <yi.zhang@huawei.com>; linux-mtd <linux-mtd@lists.infradead.org>; linux-kernel <linux-kernel@vger.kernel.org> 主题: Re: 答复: [PATCH RFC] ubi: ubi_wl_get_peb: Replace a limited number of attempts with polling while getting PEB
----- Ursprüngliche Mail ----- > Von: "chengzhihao1" <chengzhihao1@huawei.com> > An: "richard" <richard@nod.at>, "yi zhang" <yi.zhang@huawei.com> > CC: "linux-mtd" <linux-mtd@lists.infradead.org>, "linux-kernel" > <linux-kernel@vger.kernel.org> > Gesendet: Donnerstag, 1. August 2019 11:13:20 > Betreff: 答复: [PATCH RFC] ubi: ubi_wl_get_peb: Replace a limited number > of attempts with polling while getting PEB
> I don't quite understand why a limited number of attempts have been > made to get a free PEB in ubi_wl_get_peb (in fastmap-wl.c). I proposed > this PATCH with reference to the implementation of ubi_wl_get_peb (in > wl.c). As far as I know, getting PEB by polling probably won't fall into soft-lockup. > ubi_update_fastmap may add new tasks (including erase task or wl > taskk, wl tasks generally do not generate additional free PEBs) to > ubi->works, and produce_free_peb will eventually complete all tasks in > ubi->works or obtain an free PEB that can be filled into pool.
You send this patch three times, I guess your mail setup has issues? :-) This is one of the darkest corners of Fastmap where things get messy. The number of retry attempts was limited to avoid a live lock.
I agree that allowing only one retry is a little to few. With nandsim, a small nand and a fast PC you can hit that.
Do you have numbers how many attempts were needed to get a free block?
Thanks, //richard
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