From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joonas Lahtinen Subject: Re: [RFC] drm: Optimise drm_ioctl() for small user args Date: Tue, 30 May 2017 16:24:23 +0300 Message-ID: <1496150663.3977.25.camel@linux.intel.com> References: <20170530125520.14030-1-chris@chris-wilson.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20170530125520.14030-1-chris@chris-wilson.co.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Chris Wilson , dri-devel@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org T24gdGksIDIwMTctMDUtMzAgYXQgMTM6NTUgKzAxMDAsIENocmlzIFdpbHNvbiB3cm90ZToKPiBX aGVuIGxvb2tpbmcgYXQgc2ltcGxlIGlvY3RscyBjb3VwbGVkIHdpdGggY29udmVuaWVudGx5IHNt YWxsIHVzZXIKPiBwYXJhbWV0ZXJzLCB0aGUgb3ZlcmhlYWQgb2YgdGhlIHN5c2NhbGwgYW5kIGRy bV9pb2N0bCgpIHByZXNlbnQgbGFyZ2UKPiBsb3cgaGFuZ2luZyBmcnVpdC4gUHJvZmlsaW5nIHRy aXZpYWwgbWljcm9iZW5jaG1hcmtzIGFyb3VuZAo+IGk5MTVfZ2VtX2J1c3lfaW9jdGwsIHRoZSBs b3cgaGFuZ2luZyBmcnVpdCBjb21wcmlzZXMgb2YgdGhlIGNhbGwgdG8KPiBjb3B5X3VzZXIoKS4g VGhvc2UgY2FsbHMgYXJlIG9ubHkgaW5saW5lZCBieSB0aGUgbWFjcm8gd2hlcmUgdGhlCj4gY29u c3RhbnQgaXMga25vd24gYXQgY29tcGlsZS10aW1lLCBidXQgdGhlIGlvY3RsIGFyZ3VtZW50IHNp emUgZGVwZW5kcwo+IG9uIHRoZSBpb2N0bCBudW1iZXIuIFRvIGhlbHAgdGhlIGNvbXBpbGVyLCBl eHBsaWNpdGx5IGFkZCBzd2l0Y2hlcyBmb3IKPiB0aGUgc21hbGwgc2l6ZXMgdGhhdCBleHBhbmQg dG8gc2ltcGxlIG1vdmVzIHRvL2Zyb20gdXNlci4gRG9pbmcgdGhlCj4gbXVsdGlwbGUgaW5saW5l cyBkb2VzIGFkZCBzaWduaWZpY2FudCBjb2RlIGJsb2F0LCBzbyBpdCBpcyB2ZXJ5Cj4gZGViYXRh YmxlIGFzIHRvIGl0cyB2YWx1ZS4gQmFjayB0byB0aGUgdHJpdmlhbCwgYnV0IGZyZXF1ZW50bHkg dXNlZCwKPiBleGFtcGxlIG9mIGk5MTVfZ2VtX2J1c3lfaW9jdGwoKSBvbiBhIEJyb2Fkd2VsbCBh dm9pZGluZyB0aGUgY2FsbCBnaXZlcwo+IHVzIGEgMTUtMjUlIGltcHJvdmVtZW50Ogo+IAo+IAkJ CcKgYmVmb3JlCQnCoMKgYWZ0ZXIKPiAJc2luZ2xlCQkxMDAuMTczbnMJwqA4NC40OTZucwo+IAlw YXJhbGxlbCAoeDQpCTIwNC4yNzVucwkxNTIuOTU3bnMKPiAKPiBPbiBhIGJhYnkgQnJveHRvbiBu dWM6Cj4gCj4gCQkJYmVmb3JlwqDCoMKgwqDCoMKgwqDCoMKgwqDCoGFmdGVyCj4gCXNpbmdsZQkJ MjQ1LjM1NW5zCTE5OS40Nzducwo+IAlwYXJhbGxlbCAoeDIpCTI4MC44OTJucwkyMzIuNzI2bnMK PiAKPiBMb29raW5nIGF0IHRoZSBjb3N0IGRpc3RyaWJ1dGlvbiBieSBtb3ZpbmcgYW4gZXF1aXZh bGVudCBzd2l0Y2ggaW50bwo+IGFyY2gveDg2L2xpYi91c2VyY29weSwgdGhlIG92ZXJoZWFkIHRv IHRoZSBjb3B5IHVzZXIgaXMgc3BsaXQgYWxtb3N0Cj4gZXF1YWxseSBiZXR3ZWVuIHRoZSBmdW5j dGlvbiBjYWxsIGFuZCB0aGUgYWN0dWFsIGNvcHkgaXRzZWxmLiBJdCBzZWVtcwo+IGNvcHlfdXNl cl9lbmhhbmNlZF9mYXN0X3N0cmluZyBzaW1wbHkgaXMgbm90IHRoYXQgZ29vZCBhdCBzbWFsbCAo c2luZ2xlCj4gcmVnaXN0ZXIpIGNvcGllcy4gU29tZXRoaW5nIGFzIHNpbXBsZSBhcwo+IAo+IEBA IC0yOCw2ICsyOCw5IEBAIGNvcHlfdXNlcl9nZW5lcmljKHZvaWQgKnRvLCBjb25zdCB2b2lkICpm cm9tLCB1bnNpZ25lZCBsZW4pCj4gwqB7Cj4gwqDCoMKgwqDCoMKgwqDCoHVuc2lnbmVkIHJldDsK PiAKPiArwqDCoMKgwqDCoMKgwqBpZiAobGVuIDw9IDE2KQo+ICvCoMKgwqDCoMKgwqDCoMKgwqDC oMKgwqDCoMKgwqByZXR1cm4gY29weV91c2VyX2dlbmVyaWNfdW5yb2xsZWQodG8sIGZyb20sIGxl bik7Cj4gCj4gaXMgZW5vdWdoIHRvIHNwZWVkIHVwIGk5MTVfZ2VtX2J1c3lfaW9jdGwoKSBieSAx MCUgOnwKPiAKPiBOb3RlIHRoYXQgdGhpcyBvdmVyaGVhZCBtYXkgZW50aXJlbHkgYmUgeDg2IHNw ZWNpZmljLgo+IAo+IFNpZ25lZC1vZmYtYnk6IENocmlzIFdpbHNvbiA8Y2hyaXNAY2hyaXMtd2ls c29uLmNvLnVrPgo+IENjOiBKb29uYXMgTGFodGluZW4gPGpvb25hcy5sYWh0aW5lbkBsaW51eC5p bnRlbC5jb20+CgpJIHRoaW5rIHRoaXMgc2hvdWxkIGJlIGludGVncmF0ZWQgaW50b8KgX19jb3B5 X3t0byxmcm9tfV91c2VyIGRpcmVjdGx5LApidXQgaW4gdGhlIG1lYW53aGlsZSB0aGUgY29kZSBp czsKClJldmlld2VkLWJ5OiBKb29uYXMgTGFodGluZW4gPGpvb25hcy5sYWh0aW5lbkBsaW51eC5p bnRlbC5jb20+CgpSZWdhcmRzLCBKb29uYXMKLS0gCkpvb25hcyBMYWh0aW5lbgpPcGVuIFNvdXJj ZSBUZWNobm9sb2d5IENlbnRlcgpJbnRlbCBDb3Jwb3JhdGlvbgpfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1k ZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcv bWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK