From owner-freebsd-emulation@FreeBSD.ORG Sun Apr 15 13:03:06 2012 Return-Path: Delivered-To: freebsd-emulation@freebsd.org Received: by hub.freebsd.org (Postfix, from userid 1233) id 50E811065673; Sun, 15 Apr 2012 13:03:06 +0000 (UTC) Date: Sun, 15 Apr 2012 13:03:06 +0000 From: Alexander Best To: Alexander Leidinger Message-ID: <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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120415143441.00000948@unknown> Cc: freebsd-emulation@freebsd.org Subject: Re: [PATCH] pipe2 for Linuxulator X-BeenThere: freebsd-emulation@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Development of Emulators of other operating systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Apr 2012 13:03:06 -0000 On Sun Apr 15 12, Alexander Leidinger wrote: > On Sun, 15 Apr 2012 11:51:12 +0000 Alexander Best > 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) Stacktrace of last lock operation of the futex_mtx: kernel`linux_sys_futex+0xd34 kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 Stacktrace of last lock operation of the futex_mtx: kernel`linux_sys_futex+0xd57 kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 Stacktrace of last lock operation of the futex_mtx: kernel`linux_sys_futex+0xd57 kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 ERROR: missing_access_check in linuxulator32:futex:futex_atomic_op 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) this is from the check_error.d script: otaku% sudo ./check_error.d ERROR: sleep_error in linuxulator32:futex:futex_sleep kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2a12800029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_wait kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2a12800029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_sleep kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2e94900029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_wait kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2e94900029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_sleep kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x30c4f00029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_wait kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x30c4f00029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_sleep kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2e94900029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_wait kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2e94900029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_sleep kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2a12800029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_wait kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x2a12800029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_sleep kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x30c4f00029d5fa5c ERROR: sleep_error in linuxulator32:futex:futex_wait kernel`ia32_syscall+0x299 kernel`0xffffffff805b05e5 0x287b6278 0x30c4f00029d5fa5c 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: otaku% sudo ./check_internal_locks.d ^C Number of locks per type: otaku% sudo ./check_internal_locks.d dtrace: 42 failed speculations (available buffer(s) still busy) dtrace: 61 failed speculations (available buffer(s) still busy) dtrace: 183 failed speculations (available buffer(s) still busy) dtrace: 830 failed speculations (available buffer(s) still busy) dtrace: 893 failed speculations (available buffer(s) still busy) dtrace: 1489 failed speculations (available buffer(s) still busy) dtrace: 1546 failed speculations (available buffer(s) still busy) dtrace: 1208 failed speculations (available buffer(s) still busy) dtrace: 1418 failed speculations (available buffer(s) still busy) dtrace: 1219 failed speculations (available buffer(s) still busy) dtrace: 249 failed speculations (available buffer(s) still busy) dtrace: 248 failed speculations (available buffer(s) still busy) dtrace: 1487 failed speculations (available buffer(s) still busy) dtrace: 443 failed speculations (available buffer(s) still busy) dtrace: 684 failed speculations (available buffer(s) still busy) dtrace: 726 failed speculations (available buffer(s) still busy) dtrace: 745 failed speculations (available buffer(s) still busy) dtrace: 800 failed speculations (available buffer(s) still busy) dtrace: 1033 failed speculations (available buffer(s) still busy) dtrace: 1693 failed speculations (available buffer(s) still busy) dtrace: 3461 failed speculations (available buffer(s) still busy) dtrace: 4746 failed speculations (available buffer(s) still busy) dtrace: 2645 failed speculations (available buffer(s) still busy) dtrace: 965 failed speculations (available buffer(s) still busy) ^C dtrace: 1394 failed speculations (available buffer(s) still busy) Number of locks per type: emul_shared_rlock 3 emul_shared_wlock 37 emul_lock 55 futex_mtx 31179 cheers. alex ps: i added freebsd-emulation@ back to the CC list. > > We don't have emulation@ in CC anymore, but I think the output of the > stats and the output of the other scripts could be interesting for > people on emulation@. > > Bye, > Alexander. > > -- > http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 > http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137