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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM9PR10MB4869.EURPRD10.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 40a084a8-8379-4031-cac5-08da659fec92 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Jul 2022 13:51:16.9438 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: KPv+OA+uhlCFLeK6QHkxpnQOIymMceZG8ReBmcvKs8Z3v9rOAjx8LyBYweVBHYgT0x3y0AefRCJeogePWjL0iYDXGnUNl9imu1NCz/JHxhg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR10MB3974 X-TUID: vZ2EwY5KeR6i > -----Original Message----- > From: isar-users@googlegroups.com On > Behalf Of Uladzimir Bely > Sent: Thursday, July 14, 2022 3:41 PM > To: isar-users > Cc: Kiszka, Jan (T CED) > Subject: Re: next: ccache broken for cross-compiling >=20 > In the email from Sunday, 10 July 2022 23:51:14 +03 user Jan Kiszka wrote= : > > Hi all, > > > > I've noticed that ccache is not doing its job with current next when > > cross-building, e.g. mc:qemuarm64-bullseye:linux-mainline. It does > > work as expected for native builds > > (mc:qemuamd64-bullseye:linux-mainline), > > and it works fine with v0.9. Seems like an sbuild regression. > > > > Jan >=20 > I did some checks on my side and it seems that it is not related to cross= - build, > but mostlry related to something specific to sbuild and kernel. >=20 > Just some statistics (taken from 'ccache -s' output) >=20 > 1. 'hello' cross-build for 'arm64' on 'next' branch (with sbuild) >=20 > First run: > Hits: 415 / 7479 (5.55 %) >=20 > Second run: > Hits: 7353 / 14958 (49.16 %) >=20 > Everything OK, most of requests are hits ((7353 - 415) / 7479 =3D 92.7%) >=20 > 2. 'linux-mainline' cross build for 'arm64' on 'next' branch (with sbuild= ) >=20 > First run: > Hits: 262 / 6208 (4.22 %) >=20 > Second run: > Hits: 644 / 12416 (5.19 %) >=20 > Cache usage is relatively low ((644 - 262) / 6208 =3D 5.3%) compared to '= hello' >=20 > 3. 'linux-mainline' native build for 'arm64' on 'next' branch (with sbuil= d) >=20 > First run: > Hits: 262 / 6208 (4.22 %) >=20 > Second run: > Hits: 644 / 12416 (5.19 %) >=20 > The result is the same as for cross-build ((644 - 262) / 6208 =3D 5.3%), = so the low > cache usage problem is not related to cross or native build type. >=20 > 4. 'linux-mainline' native build for 'arm64' on 'master' branch (without > sbuild) >=20 > First run: > Hits: 262 / 6208 (4.22 %) >=20 > Second run: > Hits: 6469 / 12416 (52.10 %) >=20 > Here, ccache usage is high ((6469 - 262) / 6208 =3D 99.98%) >=20 > Most probably, Henning's assumption regarding inclusion of debug informat= ion > (with different absolute paths in case of sbuild) making binaries in cach= e > 'incompatible' is true. At least when I had the issue, the debug information was the root cause for= low cache hits. But instead of guessing, it is better to simply enable the CCache debug mod= e and look into the generated debug files. There it is easy to spot the problems. Yesterday, I sent a patch on the ML to enable the debug mode in ISAR. BTW: the kernel's debug information not necessarily has to be disabled. You can also fiddle in the KCFLAG -fdebug-prefix-map=3D Felix >=20 > -- > Uladzimir Bely >=20 >=20 >=20 > -- > You received this message because you are subscribed to the Google Groups > "isar-users" group. > To unsubscribe from this group and stop receiving emails from it, send an= email > to isar-users+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgroup= s.g > oogle.com%2Fd%2Fmsgid%2Fisar- > users%2F6773152.jJDZkT8p0M%2540home&data=3D05%7C01%7Cfelix.moes > sbauer%40siemens.com%7C8a0fe8c45b8c4f05f68b08da659e845c%7C38ae3bcd > 95794fd4addab42e1495d55a%7C1%7C0%7C637934028749181086%7CUnknow > n%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haW > wiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3DqJm%2Bm1F7EQ9y0wy > kA1%2BJnooOdJo%2FMG2Va5iUSn8mGzA%3D&reserved=3D0.