From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Fernandes Subject: Re: [PATCH -next 0/3] Add support for fast mremap Date: Sat, 3 Nov 2018 11:32:08 -0700 Message-ID: <20181103183208.GA56850@google.com> References: <20181103040041.7085-1-joelaf@google.com> <6886607.O3ZT5bM3Cy@blindfold> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: linux-mips@linux-mips.org, Rich Felker , linux-sh@vger.kernel.org, Peter Zijlstra , Catalin Marinas , Dave Hansen , Will Deacon , "maintainer:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)" , Michal Hocko , linux-mm@kvack.org, lokeshgidra@google.com, sparclinux@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-riscv@lists.infradead.org, elfring@users.sourceforge.net, Jonas Bonn , linux-s390@vger.kernel.org, dancol@google.com, linux-ia64@vge.kvack.org, Yoshinori Sato , linux-xtensa@linux-xtensa.org, Richard Weinberger , Helge Deller , r.kernel.org@lithops.sigma-star.at, hughd@google.com, "James E.J. Bottomley" , kasan-dev@googleg To: Anton Ivanov Return-path: In-Reply-To: List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-snps-arc-bounces+gla-linux-snps-arc=m.gmane.org@lists.infradead.org T24gU2F0LCBOb3YgMDMsIDIwMTggYXQgMDk6MjQ6MDVBTSArMDAwMCwgQW50b24gSXZhbm92IHdy b3RlOgo+IE9uIDAzLzExLzIwMTggMDk6MTUsIFJpY2hhcmQgV2VpbmJlcmdlciB3cm90ZToKPiA+ IEpvZWwsCj4gPiAKPiA+IEFtIFNhbXN0YWcsIDMuIE5vdmVtYmVyIDIwMTgsIDA1OjAwOjM4IENF VCBzY2hyaWViIEpvZWwgRmVybmFuZGVzOgo+ID4gPiBIaSwKPiA+ID4gSGVyZSBpcyB0aGUgbGF0 ZXN0ICJmYXN0IG1yZW1hcCIgc2VyaWVzLiBUaGlzIGp1c3QgYSByZXBvc3Qgd2l0aCBLaXJpbGwn cwo+ID4gPiBBY2tlZC1ieXMgYWRkZWQuIEkgd291bGQgbGlrZSB0aGlzIHRvIGJlIGNvbnNpZGVy ZWQgZm9yIGxpbnV4IC1uZXh0LiAgSSBhbHNvCj4gPiA+IGRyb3BwZWQgdGhlIENPTkZJRyBlbmFi bGVtZW50IHBhdGNoIGZvciBhcm02NCBzaW5jZSBJIGFtIHlldCB0byB0ZXN0IGl0IHdpdGgKPiA+ ID4gdGhlIG5ldyBUTEIgZmx1c2hpbmcgY29kZSB0aGF0IGlzIGluIHZlcnkgcmVjZW50IGtlcm5l bCByZWxlYXNlcy4gKE5vbmUgb2YgbXkKPiA+ID4gYXJtNjQgZGV2aWNlcyBydW4gbWFpbmxpbmUg cmlnaHQgbm93Likgc28gSSB3aWxsIHBvc3QgdGhlIGFybTY0IGVuYWJsZW1lbnQgb25jZQo+ID4g PiBJIGdldCB0byB0aGF0LiBUaGUgcGVyZm9ybWFuY2UgbnVtYmVycyBpbiB0aGUgc2VyaWVzIGFy ZSBmb3IgeDg2Lgo+ID4gPiAKPiA+ID4gTGlzdCBvZiBwYXRjaGVzIGluIHNlcmllczoKPiA+ID4g Cj4gPiA+ICgxKSBtbTogc2VsZWN0IEhBVkVfTU9WRV9QTUQgaW4geDg2IGZvciBmYXN0ZXIgbXJl bWFwCj4gPiA+IAo+ID4gPiAoMikgbW06IHNwZWVkIHVwIG1yZW1hcCBieSAyMHggb24gbGFyZ2Ug cmVnaW9ucyAodjQpCj4gPiA+IHYxLT52MjogQWRkZWQgc3VwcG9ydCBmb3IgcGVyLWFyY2ggZW5h YmxlbWVudCAoS2lyaWxsIFNodXRlbW92KQo+ID4gPiB2Mi0+djM6IFVwZGF0ZWQgY29tbWl0IG1l c3NhZ2UgdG8gc3RhdGUgdGhlIG9wdGltaXphdGlvbiBtYXkgYWxzbwo+ID4gPiAJcnVuIGZvciBu b24tdGhwIHR5cGUgb2Ygc3lzdGVtcyAoRGFuaWVsIENvbCkuCj4gPiA+IHYzLT52NDogUmVtb3Zl IHVzZWxlc3MgcG1kX2xvY2sgY2hlY2sgKEtpcmlsbCBTaHV0ZW1vdikKPiA+ID4gCVJlYmFzZWQg b250b3Agb2YgTGludXMncyBtYXN0ZXIsIHVwZGF0ZWQgcGVyZiByZXN1bHRzIGJhc2VkCj4gPiA+ ICAgICAgICAgIG9uIHg4NiB0ZXN0aW5nLiBBZGRlZCBLaXJpbGwncyBBY2tzLgo+ID4gPiAKPiA+ ID4gKDMpIG1tOiB0cmVld2lkZTogcmVtb3ZlIHVudXNlZCBhZGRyZXNzIGFyZ3VtZW50IGZyb20g cHRlX2FsbG9jIGZ1bmN0aW9ucyAodjIpCj4gPiA+IHYxLT52MjogZml4IGFyY2gvdW0vIHByb3Rv dHlwZSB3aGljaCB3YXMgbWlzc2VkIGluIHYxIChBbnRvbiBJdmFub3YpCj4gPiA+ICAgICAgICAg IHVwZGF0ZSBjaGFuZ2Vsb2cgd2l0aCBtYW51YWwgZml4dXBzIGZvciBtNjhrIGFuZCBtaWNyb2Js YXplLgo+ID4gPiAKPiA+ID4gbm90IGluY2x1ZGVkIC0gKDQpIG1tOiBzZWxlY3QgSEFWRV9NT1ZF X1BNRCBpbiBhcm02NCBmb3IgZmFzdGVyIG1yZW1hcAo+ID4gPiAgICAgIFRoaXMgcGF0Y2ggaXMg ZHJvcHBlZCBzaW5jZSBsYXN0IHBvc3RpbmcgcGVuZGluZyBmdXJ0aGVyIHBlcmZvcm1hbmNlCj4g PiA+ICAgICAgdGVzdGluZyBvbiBhcm02NCB3aXRoIG5ldyBUTEIgZ2F0aGVyIHVwZGF0ZXMuIFNl ZSBub3RlcyBpbiBwYXRjaAo+ID4gPiAgICAgIHRpdGxlZCAibW06IHNwZWVkIHVwIG1yZW1hcCBi eSA1MDB4IG9uIGxhcmdlIHJlZ2lvbnMiIGZvciBtb3JlCj4gPiA+ICAgICAgZGV0YWlscy4KPiA+ ID4gCj4gPiBUaGlzIGJyZWFrcyBVTUwgYnVpbGQ6Cj4gPiAgICBDQyAgICAgIG1tL21yZW1hcC5v Cj4gPiBtbS9tcmVtYXAuYzogSW4gZnVuY3Rpb24g4oCYbW92ZV9ub3JtYWxfcG1k4oCZOgo+ID4g bW0vbXJlbWFwLmM6MjI5OjI6IGVycm9yOiBpbXBsaWNpdCBkZWNsYXJhdGlvbiBvZiBmdW5jdGlv biDigJhzZXRfcG1kX2F04oCZOyBkaWQgeW91IG1lYW4g4oCYc2V0X3B0ZV9hdOKAmT8gWy1XZXJy b3I9aW1wbGljaXQtZnVuY3Rpb24tZGVjbGFyYXRpb25dCj4gPiAgICBzZXRfcG1kX2F0KG1tLCBu ZXdfYWRkciwgbmV3X3BtZCwgcG1kKTsKPiA+ICAgIF5+fn5+fn5+fn4KPiA+ICAgIHNldF9wdGVf YXQKPiA+ICAgIENDICAgICAgY3J5cHRvL3JuZy5vCj4gPiAgICBDQyAgICAgIGZzL2RpcmVjdC1p by5vCj4gPiBjYzE6IHNvbWUgd2FybmluZ3MgYmVpbmcgdHJlYXRlZCBhcyBlcnJvcnMKPiA+IAo+ ID4gVG8gdGVzdCB5b3Vyc2VsZiwganVzdCBydW4gb24gYSB4ODYgYm94Ogo+ID4gJCBtYWtlIGRl ZmNvbmZpZyBBUkNIPXVtCj4gPiAkIG1ha2UgbGludXggQVJDSD11bQo+ID4gCj4gPiBUaGFua3Ms Cj4gPiAvL3JpY2hhcmQKPiA+IAo+ID4gCj4gPiAKPiAKPiBVTSBzb21laG93IG1hbmFnZWQgdG8g bWlzcyBvbmUgb2YgdGhlIDMtbGV2ZWwgZnVuY3Rpb25zLCBJIHNlbnQgYSBwYXRjaCBhdAo+IHNv bWUgcG9pbnQgdG8gYWRkIHRvIHRoZSBtbXJlbWFwIHNlcmllcywgYnV0IGl0IGxvb2tzIGxpa2Ug aXQgZGlkIG5vdCBnZXQKPiBpbmNsdWRlZCBpbiB0aGUgZmluYWwgdmVyc2lvbi4KPiAKPiBZb3Ug bmVlZCB0aGVzZSB0d28gaW5jcmVtZW50YWwgb24gdG9wIG9mIEpvZWwncyBwYXRjaC4gUmljaGFy ZCAtIGZlZWwgZnJlZQo+IHRvIHJlbG9jYXRlIHRoZSBhY3R1YWwgaW1wbGVtZW50YXRpb24gb2Yg dGhlIHNldF9wZ2RfYXQgZWxzZXdoZXJlIC0gSSBwdXQgaXQKPiBhdCB0aGUgZW5kIG9mIHRsYi5j Cj4gCj4gZGlmZiAtLWdpdCBhL2FyY2gvdW0vaW5jbHVkZS9hc20vcGd0YWJsZS5oIGIvYXJjaC91 bS9pbmNsdWRlL2FzbS9wZ3RhYmxlLmgKPiBpbmRleCA3NDg1Mzk4ZDA3MzcuLjE2OTJkYTU1ZTYz YSAxMDA2NDQKPiAtLS0gYS9hcmNoL3VtL2luY2x1ZGUvYXNtL3BndGFibGUuaAo+ICsrKyBiL2Fy Y2gvdW0vaW5jbHVkZS9hc20vcGd0YWJsZS5oCj4gQEAgLTM1OSw0ICszNTksNyBAQCBkbyB7wqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKg wqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBcCj4gwqDCoMKgwqDCoMKgwqAgX19m bHVzaF90bGJfb25lKCh2YWRkcikpO8KgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgXAo+IMKg fSB3aGlsZSAoMCkKPiAKPiArZXh0ZXJuIHZvaWQgc2V0X3BtZF9hdChzdHJ1Y3QgbW1fc3RydWN0 ICptbSwgdW5zaWduZWQgbG9uZyBhZGRyLAo+ICvCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKg IHBtZF90ICpwbWRwLCBwbWRfdCBwbWQpOwo+ICsKPiDCoCNlbmRpZgo+IGRpZmYgLS1naXQgYS9h cmNoL3VtL2tlcm5lbC90bGIuYyBiL2FyY2gvdW0va2VybmVsL3RsYi5jCj4gaW5kZXggNzYzZDM1 YmRkYTAxLi5kMTdiNzQxODRiYTAgMTAwNjQ0Cj4gLS0tIGEvYXJjaC91bS9rZXJuZWwvdGxiLmMK PiArKysgYi9hcmNoL3VtL2tlcm5lbC90bGIuYwo+IEBAIC02NDcsMyArNjQ3LDkgQEAgdm9pZCBm b3JjZV9mbHVzaF9hbGwodm9pZCkKPiDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgdm1h ID0gdm1hLT52bV9uZXh0Owo+IMKgwqDCoMKgwqDCoMKgIH0KPiDCoH0KPiArdm9pZCBzZXRfcG1k X2F0KHN0cnVjdCBtbV9zdHJ1Y3QgKm1tLCB1bnNpZ25lZCBsb25nIGFkZHIsCj4gK8KgwqDCoMKg wqDCoMKgwqDCoMKgwqDCoMKgwqAgcG1kX3QgKnBtZHAsIHBtZF90IHBtZCkKPiArewo+ICvCoMKg wqDCoMKgwqAgKnBtZHAgPSBwbWQ7Cj4gK30KPiArCj4gCgpMb29rcyBsaWtlIG1vcmUgYXJjaGl0 ZWN0dXJlcyBkb24ndCBkZWZpbmUgc2V0X3BtZF9hdC4gSSBhbSB0aGlua2luZyB0aGUKZWFzaWVz dCB3YXkgZm9yd2FyZCBpcyB0byBqdXN0IGRvIHRoZSBmb2xsb3dpbmcsIGluc3RlYWQgb2YgZGVm aW5pbmcKc2V0X3BtZF9hdCBmb3IgZXZlcnkgYXJjaGl0ZWN0dXJlIHRoYXQgZG9lc24ndCBjYXJl IGFib3V0IGl0LiBUaG91Z2h0cz8KCmRpZmYgLS1naXQgYS9tbS9tcmVtYXAuYyBiL21tL21yZW1h cC5jCmluZGV4IDdjZjZiMDk0MzA5MC4uMzFhZDY0ZGNkYWU2IDEwMDY0NAotLS0gYS9tbS9tcmVt YXAuYworKysgYi9tbS9tcmVtYXAuYwpAQCAtMjgxLDcgKzI4MSw4IEBAIHVuc2lnbmVkIGxvbmcg bW92ZV9wYWdlX3RhYmxlcyhzdHJ1Y3Qgdm1fYXJlYV9zdHJ1Y3QgKnZtYSwKIAkJCXNwbGl0X2h1 Z2VfcG1kKHZtYSwgb2xkX3BtZCwgb2xkX2FkZHIpOwogCQkJaWYgKHBtZF90cmFuc191bnN0YWJs ZShvbGRfcG1kKSkKIAkJCQljb250aW51ZTsKLQkJfSBlbHNlIGlmIChleHRlbnQgPT0gUE1EX1NJ WkUgJiYgSVNfRU5BQkxFRChDT05GSUdfSEFWRV9NT1ZFX1BNRCkpIHsKKwkJfSBlbHNlIGlmIChl eHRlbnQgPT0gUE1EX1NJWkUpIHsKKyNpZmRlZiBDT05GSUdfSEFWRV9NT1ZFX1BNRAogCQkJLyoK IAkJCSAqIElmIHRoZSBleHRlbnQgaXMgUE1ELXNpemVkLCB0cnkgdG8gc3BlZWQgdGhlIG1vdmUg YnkKIAkJCSAqIG1vdmluZyBhdCB0aGUgUE1EIGxldmVsIGlmIHBvc3NpYmxlLgpAQCAtMjk2LDYg KzI5Nyw3IEBAIHVuc2lnbmVkIGxvbmcgbW92ZV9wYWdlX3RhYmxlcyhzdHJ1Y3Qgdm1fYXJlYV9z dHJ1Y3QgKnZtYSwKIAkJCQlkcm9wX3JtYXBfbG9ja3Modm1hKTsKIAkJCWlmIChtb3ZlZCkKIAkJ CQljb250aW51ZTsKKyNlbmRpZgogCQl9CiAKIAkJaWYgKHB0ZV9hbGxvYyhuZXdfdm1hLT52bV9t bSwgbmV3X3BtZCkpCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fXwpsaW51eC1zbnBzLWFyYyBtYWlsaW5nIGxpc3QKbGludXgtc25wcy1hcmNAbGlzdHMuaW5m cmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xp bnV4LXNucHMtYXJj