Date: Sun, 2 Apr 2017 03:27:04 +0000 (UTC) From: Jin Guojun <jguojun@sbcglobal.net> To: FreeBSD Questions Mailing List <freebsd-questions@freebsd.org> Subject: Re: 10.3 system hangs when existing from X with radeon cards/driver Message-ID: <1167907592.9096642.1491103624078@mail.yahoo.com> In-Reply-To: <1367028502.7607768.1490997691827@mail.yahoo.com> References: <1367028502.7607768.1490997691827.ref@mail.yahoo.com> <1367028502.7607768.1490997691827@mail.yahoo.com>
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This seems not the Xorg server issue.Replaced xf86-video-ati (ati_drv.so, radeon_drv.so) from working 11.0 system, the problem persists.Then, replace xorg-server 1.17.x from 11.0 as well, existing X using radeon video cards still hangs the system.Not sure if this is caused by some dynamic libraries X uses.
On Friday, March 31, 2017 3:01 PM, Jin Guojun <jguojun@sbcglobal.net> wrote:
When using Radeon Video cards (X600/RV370, HD2400/RV610, HD4650/RV730) in FreeBSD 10.3, existing X causes system hanging.Event installed the xorg-7.7_2 with latest xf86-video-ati driver released on Feb 24, 2017, this problem still exists.
The xorg-7.7_2 in FreeBSD 11.0 and 12-Current do not have this problem.Has anyone seen this problem?And any suggestion on solving this problem on 10.3-R?
-Jin
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To: freebsd-questions@freebsd.org
From: Yubin Ruan <ablacktshirt@gmail.com>
Subject: Understanding the FreeBSD locking mechanism
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Hi,
I am reading the FreeBSD source code related to its locking mechanism. I
have done some researches but still cannot understand some codes.
Let's take `spinlock' for example. I know there are different kinds of
mutex in FreeBSD: spin mutex and other kinds of mutex. I try to locate
the source of spin mutex but what I find all look very weird to me. For
example, the `spinlock_enter()`
1816 void
1817 spinlock_enter(void)
1818 {
1819 struct thread *td;
1820 register_t flags;
1821
1822 td = curthread;
1823 if (td->td_md.md_spinlock_count == 0) {
1824 flags = intr_disable();
1825 td->td_md.md_spinlock_count = 1;
1826 td->td_md.md_saved_flags = flags;
1827 } else
1828 td->td_md.md_spinlock_count++;
1829 critical_enter();
1830 }
Does this function provides the ordinary "spinlock" functionality? There
is no special "test-and-set" instruction, and neither any extra locking
to protect internal data structure manipulation. Isn't this subjected to
race condition?
I also checked the `mtx_lock()`, but neither can't find a seemingly
correct implementation.
Do I miss anything? Which is the real implementation of the spin lock in
FreeBSD?
Thanks
Yubin Ruan
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