On 2018/07/10 21:40, Martijn Coenen wrote: > On Tue, Jul 10, 2018 at 2:09 PM, Tetsuo Handa > <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: >> I don't have benchmark data (I'm not an Android user). But an example log at >> https://syzkaller.appspot.com/text?tag=CrashLog&x=12f316fc400000 got >> about 13214 messages in 124 seconds (over 100 messages per a second). > > I meant data for the cond_resched() change, which could have an impact > on IPC latency. But yeah, this is a lot. We typically don't see these > messages on Android userspace, because most of them would be caused be > userspace errors that can't happen when using binder libraries. > Obviously syzkaller doesn't use those. I think we'd like to keep > having these in Android builds, let me discuss internally if we can > just switch the default debug level and enable them in Android through > other means. Any progress on this problem? > >> Without disabling by default or latelimit printk(), the system shall become unusable. >> >> $ grep binder: log | wc -l >> 13214 >> $ head log >> [ 1167.389978] binder: 15631:15631 got reply transaction with no transaction stack >> [ 1167.391813] binder: 15629:15629 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1167.399282] binder: 15631:15631 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1167.399548] binder: undelivered TRANSACTION_ERROR: 29201 >> [ 1167.419645] binder: 15625:15625 got reply transaction with no transaction stack >> [ 1167.427800] binder: 15625:15625 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1167.461506] binder: 15634:15634 got reply transaction with no transaction stack >> [ 1167.469060] binder: 15634:15634 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1167.472747] binder: 15638:15638 got reply transaction with no transaction stack >> [ 1167.477550] binder: 15633:15633 got reply transaction with no transaction stack >> $ tail log >> [ 1291.131046] binder: 25566:25566 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1291.140761] binder: 25553:25553 got reply transaction with no transaction stack >> [ 1291.151698] binder: 25553:25553 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1291.182362] binder: 25568:25568 got reply transaction with no transaction stack >> [ 1291.183361] binder: undelivered TRANSACTION_ERROR: 29201 >> [ 1291.189926] binder: 25568:25568 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1291.204438] binder: 25569:25569 got reply transaction with no transaction stack >> [ 1291.211953] binder: 25569:25569 transaction failed 29201/-71, size 0-8 line 2759 >> [ 1291.213825] binder: 25572:25572 got reply transaction with no transaction stack >> [ 1291.227018] binder: 25572:25572 transaction failed 29201/-71, size 0-8 line 2759 > _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
