Date: Sun, 15 Apr 2012 16:30:59 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Alexander Best <arundel@freebsd.org> Cc: freebsd-emulation@freebsd.org Subject: Re: [PATCH] pipe2 for Linuxulator Message-ID: <20120415163059.0000715d@unknown> In-Reply-To: <20120415130306.GA95208@freebsd.org> References: <20120414155427.000056c1@unknown> <20120414203256.GB19712@freebsd.org> <20120414224746.000005fb@unknown> <20120415000246.0000736b@unknown> <20120415000216.GA53624@freebsd.org> <20120415101157.GA67049@freebsd.org> <20120415112308.GA77985@freebsd.org> <20120415134444.000005cc@unknown> <20120415115112.GA83717@freebsd.org> <20120415143441.00000948@unknown> <20120415130306.GA95208@freebsd.org>
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On Sun, 15 Apr 2012 13:03:06 +0000 Alexander Best <arundel@freebsd.org> wrote: > On Sun Apr 15 12, Alexander Leidinger wrote: > > On Sun, 15 Apr 2012 11:51:12 +0000 Alexander Best > > <arundel@freebsd.org> wrote: > > > > > ahh ok. i've managed to get some stats via stats_timing.d. this > > > is a snapshot during which a newly loaded tab in chromium was > > > unresponsive for about 5 seconds. without the linux flash plugin > > > running i never experienced such lock ups. > > > > > > i've attached the d-script stats. > > > > What about the trace_futexes script and the two check_* scripts? The > > stats show that there is a lot of work spend in the futexes. > > i'm having problems with those scripts. they have a negative impact > on the linux processes. when i have the player at www.mixcloud.com > running and run those scripts the music stops and the flash graphics > get all distorted. here's some output from the trace_futexes.d script: > > otaku% sudo ./trace_futexes.d > dtrace: 808 dynamic variable drops with non-empty dirty list > dtrace: 833 failed speculations (available buffer(s) still busy) You should increase the buffers in the scripts, they are overflowing. [...] > ERROR: missing_access_check in linuxulator32:futex:futex_atomic_op This is missing code in the kernel... or a superfluous comment. > kernel`ia32_syscall+0x299 > kernel`0xffffffff805b05e5 > > dtrace: ERROR: open failed: No such file or directory > `0x287b6533 > Fatal error 'mutex is on list' at line 424 in > file /usr/github-freebsd-head/lib/libthr/thread/thr_mutex.c (errno = > 0) No idea. > this is from the check_error.d script: > > otaku% sudo ./check_error.d > ERROR: sleep_error in linuxulator32:futex:futex_sleep Well... the sx_sleep returned with a non-null value. I assume this means a timeout fired. No idea if it is good or bad. > kernel`ia32_syscall+0x299 > kernel`0xffffffff805b05e5 > > 0x287b6278 > 0x2a12800029d5fa5c > ERROR: sleep_error in linuxulator32:futex:futex_wait As above. > kernel`ia32_syscall+0x299 > kernel`0xffffffff805b05e5 > > 0x287b6278 > 0x2a12800029d5fa5c > the check_internal_locks.d scripts seems to work fine. i think we > talked about the failed-speculation-warnings beforehand and that they > aren't critical: Yes and no... you do not have enough buffers to store all the info the script want to store. As such it does not work as intended. > Number of locks per type: > emul_shared_rlock 3 > emul_shared_wlock 37 > emul_lock 55 > futex_mtx 31179 Depending on how long you traced: that's a lot of futex operations. Bye, Alexander. -- http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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