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dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=windriver.com; Received: from BY5PR11MB4241.namprd11.prod.outlook.com (2603:10b6:a03:1ca::13) by BY5PR11MB4226.namprd11.prod.outlook.com (2603:10b6:a03:1bf::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4129.26; Wed, 19 May 2021 05:32:31 +0000 Received: from BY5PR11MB4241.namprd11.prod.outlook.com ([fe80::551b:e310:2ae4:3011]) by BY5PR11MB4241.namprd11.prod.outlook.com ([fe80::551b:e310:2ae4:3011%6]) with mapi id 15.20.4129.032; Wed, 19 May 2021 05:32:31 +0000 Subject: Re: [PATCH] arm: make the size of vmalloc in cmdline and meminfo uniform From: "Xu, Yanfei" To: "Russell King (Oracle)" Cc: rppt@kernel.org, ardb@kernel.org, linus.walleij@linaro.org, akpm@linux-foundation.org, carver4lio@163.com, tiantao6@hisilicon.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20210518111254.3820480-1-yanfei.xu@windriver.com> <20210518112932.GV12395@shell.armlinux.org.uk> <20210518120633.GW12395@shell.armlinux.org.uk> <63618f13-07cf-6867-bcb1-7a725e6f3ef4@windriver.com> Message-ID: Date: Wed, 19 May 2021 13:32:23 +0800 User-Agent: Mozilla/5.0 (X11; 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When use the "vmalloc=" parameter, user >>>> expect to get the size what they input, and no need to consider the 8M >>>> "hole" hided in codes. This commit make real vmalloc size equal to >>>> value >>>> of "vmalloc=" in cmdline. >>>> >>>> Also, the commit will reduce the size of vmalloc printed in boot >>>> message >>>> by 8M when the size set in cmdline is irrational. >>> >>> Hi, >>> >>> I think I'd like to do several cleanups with this: >>> >>> 1. change vmalloc_min to be an unsigned long. >>> 2. exclude VMALLOC_OFFSET from vmalloc_min, moving it into >>>     adjust_lowmem_bounds where vmalloc_min is used. >>> 3. rename vmalloc_min to be vmalloc_start >>> 4. enforce vmalloc_start to be a multiple of 2MiB >>> 5. in early_vmalloc(), calculate vmalloc_max as: >>>        VMALLOC_END - (PAGE_OFFSET + SZ_32M + VMALLOC_OFFSET) >>>     and use that to set the upper bound of vmalloc_reserve (which is >>>     something your patch doesn't do, which I think is a bug. >>> >>> Thoughts? >> >> I've slightly modified the above idea, and will shortly follow up with >> some patches to show the idea a bit better... >> > > Thanks for making it better! > Hi Russell, I am not much familar with community contribution. In this case, what kind of tags should I reply? signed-off-by? Reviewed-by? or any other tags? Regards, Yanfei > Regards, > Yanfei >> -- >> RMK's Patch system: >> https://urldefense.com/v3/__https://www.armlinux.org.uk/developer/patches/__;!!AjveYdw8EvQ!Mz6E44Glfsb6CPijsZ50Ofca9g8UAgL2MRQpaxa18ZTAIrVQpH0IcyqGDwHSWphEoo8$ >> FTTP is here! 40Mbps down 10Mbps up. 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charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org CgpPbiA1LzE5LzIxIDEyOjM5IFBNLCBYdSwgWWFuZmVpIHdyb3RlOgo+IAo+IAo+IE9uIDUvMTgv MjEgODowNiBQTSwgUnVzc2VsbCBLaW5nIChPcmFjbGUpIHdyb3RlOgo+PiBbUGxlYXNlIG5vdGU6 IFRoaXMgZS1tYWlsIGlzIGZyb20gYW4gRVhURVJOQUwgZS1tYWlsIGFkZHJlc3NdCj4+Cj4+IE9u IFR1ZSwgTWF5IDE4LCAyMDIxIGF0IDEyOjI5OjMyUE0gKzAxMDAsIFJ1c3NlbGwgS2luZyAoT3Jh Y2xlKSB3cm90ZToKPj4+IE9uIFR1ZSwgTWF5IDE4LCAyMDIxIGF0IDA3OjEyOjU0UE0gKzA4MDAs IFlhbmZlaSBYdSB3cm90ZToKPj4+PiBUaGUgdmFsdWUgb2YgInZtYWxsb2M9IiBzZXQgaW4gY21k bGluZSBpcyBhbHdheXMgOE0gbW9yZSB0aGFuIHRoZSB2YWx1ZQo+Pj4+IG9mICJWbWFsbG9jVG90 YWwiIGluIG1lbWluZm8uIFdoZW4gdXNlIHRoZSAidm1hbGxvYz0iIHBhcmFtZXRlciwgdXNlcgo+ Pj4+IGV4cGVjdCB0byBnZXQgdGhlIHNpemUgd2hhdCB0aGV5IGlucHV0LCBhbmQgbm8gbmVlZCB0 byBjb25zaWRlciB0aGUgOE0KPj4+PiAiaG9sZSIgaGlkZWQgaW4gY29kZXMuIFRoaXMgY29tbWl0 IG1ha2UgcmVhbCB2bWFsbG9jIHNpemUgZXF1YWwgdG8gCj4+Pj4gdmFsdWUKPj4+PiBvZiAidm1h bGxvYz0iIGluIGNtZGxpbmUuCj4+Pj4KPj4+PiBBbHNvLCB0aGUgY29tbWl0IHdpbGwgcmVkdWNl IHRoZSBzaXplIG9mIHZtYWxsb2MgcHJpbnRlZCBpbiBib290IAo+Pj4+IG1lc3NhZ2UKPj4+PiBi eSA4TSB3aGVuIHRoZSBzaXplIHNldCBpbiBjbWRsaW5lIGlzIGlycmF0aW9uYWwuCj4+Pgo+Pj4g SGksCj4+Pgo+Pj4gSSB0aGluayBJJ2QgbGlrZSB0byBkbyBzZXZlcmFsIGNsZWFudXBzIHdpdGgg dGhpczoKPj4+Cj4+PiAxLiBjaGFuZ2Ugdm1hbGxvY19taW4gdG8gYmUgYW4gdW5zaWduZWQgbG9u Zy4KPj4+IDIuIGV4Y2x1ZGUgVk1BTExPQ19PRkZTRVQgZnJvbSB2bWFsbG9jX21pbiwgbW92aW5n IGl0IGludG8KPj4+IMKgwqDCoCBhZGp1c3RfbG93bWVtX2JvdW5kcyB3aGVyZSB2bWFsbG9jX21p biBpcyB1c2VkLgo+Pj4gMy4gcmVuYW1lIHZtYWxsb2NfbWluIHRvIGJlIHZtYWxsb2Nfc3RhcnQK Pj4+IDQuIGVuZm9yY2Ugdm1hbGxvY19zdGFydCB0byBiZSBhIG11bHRpcGxlIG9mIDJNaUIKPj4+ IDUuIGluIGVhcmx5X3ZtYWxsb2MoKSwgY2FsY3VsYXRlIHZtYWxsb2NfbWF4IGFzOgo+Pj4gwqDC oMKgwqDCoMKgIFZNQUxMT0NfRU5EIC0gKFBBR0VfT0ZGU0VUICsgU1pfMzJNICsgVk1BTExPQ19P RkZTRVQpCj4+PiDCoMKgwqAgYW5kIHVzZSB0aGF0IHRvIHNldCB0aGUgdXBwZXIgYm91bmQgb2Yg dm1hbGxvY19yZXNlcnZlICh3aGljaCBpcwo+Pj4gwqDCoMKgIHNvbWV0aGluZyB5b3VyIHBhdGNo IGRvZXNuJ3QgZG8sIHdoaWNoIEkgdGhpbmsgaXMgYSBidWcuCj4+Pgo+Pj4gVGhvdWdodHM/Cj4+ Cj4+IEkndmUgc2xpZ2h0bHkgbW9kaWZpZWQgdGhlIGFib3ZlIGlkZWEsIGFuZCB3aWxsIHNob3J0 bHkgZm9sbG93IHVwIHdpdGgKPj4gc29tZSBwYXRjaGVzIHRvIHNob3cgdGhlIGlkZWEgYSBiaXQg YmV0dGVyLi4uCj4+Cj4gCj4gVGhhbmtzIGZvciBtYWtpbmcgaXQgYmV0dGVyIQo+IApIaSBSdXNz ZWxsLAoKSSBhbSBub3QgbXVjaCBmYW1pbGFyIHdpdGggY29tbXVuaXR5IGNvbnRyaWJ1dGlvbi4g SW4gdGhpcyBjYXNlLCB3aGF0CmtpbmQgb2YgdGFncyBzaG91bGQgSSByZXBseT8gc2lnbmVkLW9m Zi1ieT8gUmV2aWV3ZWQtYnk/IG9yIGFueSBvdGhlcgp0YWdzPwoKUmVnYXJkcywKWWFuZmVpCgo+ IFJlZ2FyZHMsCj4gWWFuZmVpCj4+IC0tIAo+PiBSTUsncyBQYXRjaCBzeXN0ZW06IAo+PiBodHRw czovL3VybGRlZmVuc2UuY29tL3YzL19faHR0cHM6Ly93d3cuYXJtbGludXgub3JnLnVrL2RldmVs b3Blci9wYXRjaGVzL19fOyEhQWp2ZVlkdzhFdlEhTXo2RTQ0R2xmc2I2Q1BpanNaNTBPZmNhOWc4 VUFnTDJNUlFwYXhhMThaVEFJclZRcEgwSWN5cUdEd0hTV3BoRW9vOCQgCj4+IEZUVFAgaXMgaGVy ZSEgNDBNYnBzIGRvd24gMTBNYnBzIHVwLiBEZWNlbnQgY29ubmVjdGl2aXR5IGF0IGxhc3QhCj4+ CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1h cm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5v cmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0t a2VybmVsCg==