From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: cross compiling perf Date: Fri, 12 Aug 2016 12:48:53 +0200 Message-ID: <1728044.WAxNW5e6fy@milian-kdab2> References: <16135005.c00Xa53Rc9@milian-kdab2> <1973740.7uikfxrqxa@agathebauer> <20160805001327.GM14639@kernel.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart3558169.lKsEISflAu"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:56652 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751230AbcHLKtC (ORCPT ); Fri, 12 Aug 2016 06:49:02 -0400 In-Reply-To: <20160805001327.GM14639@kernel.org> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: acme@kernel.org Cc: hekuang@huawei.com, wangnan0@huawei.com, jolsa@kernel.org, namhyung@kernel.org, dsahern@gmail.com, adrian.hunter@intel.com, linux-perf-users@vger.kernel.org --nextPart3558169.lKsEISflAu Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Thursday, August 4, 2016 9:13:27 PM CEST Arnaldo Carvalho de Melo wrote: > Em Thu, Aug 04, 2016 at 11:58:32PM +0200, Milian Wolff escreveu: > > On Donnerstag, 4. August 2016 15:36:05 CEST Arnaldo Carvalho de Melo wrote: > > > Em Thu, Aug 04, 2016 at 05:02:01PM +0200, Milian Wolff escreveu: > > > > On Thursday, August 4, 2016 10:22:25 AM CEST Arnaldo Carvalho de Melo > > > > wrote: > > > > > Em Wed, Aug 03, 2016 at 10:56:20PM +0200, Milian Wolff escreveu: > > > > > > I hope this helps others. I finally have a working up2date perf on > > > > > > my > > > > > > aarch64 platform and it seems to work form my simple 5min tests so > > > > > > far. > > > > > > > > > > Ok, that should help people, but it is way convoluted :-\ > > > > > > > > > > How did you obtained your cross compiler environment? Some ready > > > > > made > > > > > tarball or set of distro packages? I have an ever growing set of > > > > > perf > > > > > > > > > build cointainers that includes a few cross compilers: > > > > The environment was provided to us as a tarball from a customer of > > > > ours, > > > > who probably got that from another subcontractor. > > > > > > > > > > > > > > > > export INSTALLDIR=/usr/${TARGET} && \ > > > > > > > > ^-- is that path potentially special cased in the build file? I mean > > > > you > > > > don't > > > > > > Huh? Not that I am aware, no, I just looked at where the existing cross > > > build packages were located, so that I used the same place for the cross > > > > built versions of libelf and zlib: > > > > > etc. So I assumed the best place to install the zlib and libelf devel > > > files > > > was with that path prefix. > > > > Right, I think my point above was not clear: Since you essentially put > > your > > custom libelf into the implicit sysroot and also don't specify any prefix > > to install to, it seems to work out of the box. Is this the common way > > people build perf? > > I have no idea besides what is documented for android in > tools/perf/Documentation/, and that uses a --sysroot > > > From my experience working on e.g. KDE, one often has the sysroot > > (e.g. /usr), and then a bunch of custom stuff in a prefix somewhere in > > $HOME. Doing that with perf seems to be "hard", as it's not enough to do > > > > make prefix=$HOME/path/to/foo > > > > but instead one also needs to pass `-I.../include` and `-L.../lib` to > > EXTRA_CFLAGS & LDFLAGS. I'd be willing to supply a patch to simplify this > > process, if you think that is acceptable. > > > > > See it running: > > > > > > > See? The features it is finding are just the ones related to having > > > glibc, > > > zlib and libelf devel packages that can be used in a cross build. > > > > OK, good to know. Then this clearly is something else special to my setup, > > similar to my initial problems with `--sysroot` being defined in `CC` > > rather than `EXTRA_CFLAGS`. I'll try to dig into that eventually. > > > > > > set the sysroot anywhere, nor do you seem to pass special include > > > > paths to > > > > perf. This of course works fine in a docker environment, but for > > > > "normal" > > > > development machines, where you compile and install stuff somewhere in > > > > $HOME, this won't work at all. > > > > > > Hey, a "docker environment" should be no different than a "normal" > > > development machine, it should work just the same, its just the former > > > will > > > run inside a container, but the packages are the same I would install in > > > my > > > workstation if I wanted to pollute it with a cross compiler environment. > > > Since I want to install tons of cross compiler environments, I better > > > use > > > some sort of container, docker being the most popular, I picked it. > > > > My point here is exactly the pollution that happens in my non-containered > > environment. There, I have tons of dev packages installed in e.g. /usr, > > which may potentially get picked up, as well as the "actual" stuff that > > should be used from the sysroot. But, again, at this point this is just > > speculation. > Sure, this is a valid concern and one that should grand creating a few > more containers, taking advantage of its layers stuff to reduce the > space needed, i.e. share the base stuff I have and then have another set > with the native devel packages, to test that there is no pollution and > the results are the expected ones in a cross compile env. > > > If you have the time, could you try to install some more x86 dev packages > > in your docker environments? E.g. when you install libunwind(-x86-64) - > > does it > I'll try what I described above, which is in line with your suggestion. > > > then get picked up by your arm cross compile, or does it work as it > > should? > > That data point would help me figure out what could go wrong. > > Will try tomorrow, if time allows, and will do it in the container > fashion, i.e. it should be a few more containers, testing this > possibility. Update: It seems to me that the above mess-up was due to some left-over build artifact. I just tried to reproduce this with an up2date git checkout after doing a hearty `git clean -xfd` in my linux tree. The issue is gone. I thought to have done that before, but apparently that is not the case... Sorry for the noise. I hope it may help someone out there who might run into that issue again in the future. I'll remember to use `git clean -xfd` before I report any other build related issues. Cheers -- Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts --nextPart3558169.lKsEISflAu Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD ExJVVE4gLSBEQVRBQ29ycCBTR0MwHhcNMDUwNjA3MDgwOTEwWhcNMTkwNjI0MTkwNjMwWjBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVy bmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MIIBIjAN BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt/caM+byAAQtOeBOW+0fvGwPzbX6I7bO3psRM5ek 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