When a high-priority thread is waiting for a mutex held by a
low-priority thread, it temporarily lends its priority to the
low-priority thread to prevent priority inversion. When the mutex
is released, the lent priority is revoked and the low-priority
thread goes back to its original priority.
When the priority of that thread is lowered (through a call to
sched_priority()), the schedule was not checking whether
there is now a high-priority thread in the run queue. This can
cause threads with real-time priority to be starved in the run
queue while the low-priority thread finishes its quantum.
Fix this by explicitly checking whether preemption is necessary
when a thread's priority is lowered.
Sponsored by: Dell EMC Isilon
Obtained from: Sandvine Inc
Differential Revision: https://reviews.freebsd.org/D9518
Reviewed by: Jeff Roberson (ule)
MFC after: 1 month
7500 Simplify dbuf_free_range by removing dn_unlisted_l0_blkid
illumos/illumos-gate@653af1b809653af1b809https://www.illumos.org/issues/7500
With the integration of:
commit 0f6d88aded0d165f5954688a9b13bac76c38da84
Author: Alex Reece <alex@delphix.com>
Date: Sat Jul 26 13:40:04 2014 -0800
4873 zvol unmap calls can take a very long time for larger datasets
the dnode's dn_bufs field was changed from a list to a tree. As a result,
the dn_unlisted_l0_blkid field is no longer necessary.
Author: Stephen Blinick <stephen.blinick@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>
but it allows to use 64 bit linux strace(1) on 64 bit linux binaries.
Reviewed by: dchagin (earlier version)
MFC after: 2 weeks
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D9406
Now that <sys/event.h> can be included on its own, adjust the manual
page accordingly. Remove both unnecessary #include statements from the
synopsis and the example code.
While there, also add a note to the BUGS section to mention that
previous versions of this header file still depend on <sys/types.h>.
Reviewed by: ngie, vangyzen
Differential Revision: https://reviews.freebsd.org/D9605
Right now this is not critical, but will be after planned increase of
MNAMELEN from 88 to 1k.
Reported and tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
illumos/illumos-gate@653af1b809653af1b809https://www.illumos.org/issues/7500
With the integration of:
commit 0f6d88aded0d165f5954688a9b13bac76c38da84
Author: Alex Reece <alex@delphix.com>
Date: Sat Jul 26 13:40:04 2014 -0800
4873 zvol unmap calls can take a very long time for larger datasets
the dnode's dn_bufs field was changed from a list to a tree. As a result,
the dn_unlisted_l0_blkid field is no longer necessary.
Author: Stephen Blinick <stephen.blinick@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>
While a new bit was added and thread alignment got shifted to accomodate it,
RW_READERS_SHIFT was not modified accordingly and clashed with the new flag.
This was surprisingly harmless. If the lock was taken for writing, other flags
were tested. If the lock was taken for reading, it would correctly work for
readers > 1 and this was the only relevant test performed.
machines, only a few 486 machines that used it, and those haven't had
enough memory to run FreeBSD for quite some time (often limited to
16MB).
Not to be confused with the Machine Check Architecture, which is still
very much alive and used (and untouched by this commit).
No Objection From: arch@
I found that at least with Chelsio NICs TOE sockets quite often report
negative sbspace() values. Using unsigned variable to store it resulted
in attempts to aggregate too much data in one sosend() call, that caused
errors and following connection termination.
MFC after: 2 weeks
The {powerpc,powerpc64,sparc64} LINT kernel builds fail with this error:
sys/dev/vt/vt_buf.c:198: warning: 'vtbuf_htw' defined but not used
Move vtbuf_htw() inside the '#if SC_NO_CUTPASTE' block where it belongs, and
put it in the proper order.
This fixes the immedate issue w/ vt(4), but all three then fail on different
issues.
Reviewed by: emaste
It's not a proper fix, but should be better than what we have now.
Since it got broken some six months ago it results in an incredibly
annoying and trivially reproducible panic every time eg an USB disk
gets disconnected.
MFC after: 2 weeks
Sponsored by: DARPA, AFRL
Previously we would truncate tm.tm_year for any time_t corresponding to
a year that does not fit in int. This issue was discovered because it
caused the bash-static build to fail when linking with LLD.
As reported by Rafael Espíndola:
Configure has
AC_FUNC_MKTIME
which expands to a test of mktime that fails with the freebsd
implementation. Given that, bash compiles a mktime.o file that
defines just mktime and uses localtime. That goes in a .a file
that is before libc.
The freebsd libc defines mktime in localtime.o, which also defines
localtime among other functions.
When lld sees an undefined reference to mktime from libc, it uses
the bash provided one and then tries to find a definition of
localtime. It is found on libc's localtime.o, but now we have a
duplicated error.
The reason it works with bfd is that bash doesn't use mktime
directly and the undefined reference from libc is resolved to the
libc implementation. It would also fail to link if bash itself
directly used mktime.
The bash-static configure test verifies that, for many values of t, either
localtime(t) returns NULL or mktime(localtime(t)) == t. This test failed
when localtime returned a truncated tm_year.
This was fixed in tzcode in 2004 but has persisted in our tree since
rS2708.
Reported by: Rafael Espíndola
Reviewed by: bapt
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D9534
interrupt arrives in fork_trampoline after sp_el0 was written we may then
switch to a new thread, enter userland so change this stack pointer, then
return to this code with the wrong value. This fixes this case by moving
the load of sp_el0 until after interrupts have been disabled.
Reported by: Mark Millard (markmi@dsl-only.net)
Sponsored by: ABT Systems Ltd
Differential Revision: https://reviews.freebsd.org/D9593
Current bxe probe function won't attach to devices with the NetXtreme II
BCM57840 2x20GbE chip, enable it by adding it's chip ID to the list of
supported chips.
Tested on: HP ProLiant WS460c Gen9
Reviewed by: gnn
MFC after: 1 week
Sponsored by: Citrix Systems R&D
Differential Revision: https://reviews.freebsd.org/D9609
we will import a newer version of the Linux code so the linuxkpi was not
used.
This is still missing 10G support, and multicast has not been tested.
Reviewed by: gnn
Obtained from: ABT Systems Ltd
Sponsored by: SoftIron Inc
Differential Revision: https://reviews.freebsd.org/D8549
On laptops like the ThinkPad X240, ClickPad buttons are located at the
top. The hw.psm.synaptics.softbuttons_y sysctl was supposed to allow this
by setting the value to a negative one (e.g. -1700). However, the
condition was wrong (double negative), and doing that placed the buttons
in an unreachable area.
PR: 216342
Submitted by: Greg V <greg@unrelenting.technology>
MFC after: 1 week
This effectively provides the same benefit as applying MADV_FREE inline
upon every execve, since the page daemon invokes lowmem handlers prior to
scanning the inactive queue. It also has less overhead; the cost of
applying MADV_FREE is very noticeable on many-CPU systems since it includes
that of a TLB shootdown of global PTEs. For instance, this change nearly
halves the system CPU usage during a buildkernel on a 128-vCPU EC2
instance (with some other patches applied).
Benchmarked by: cperciva (earlier version)
Reviewed by: kib
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D9586
This solves several problems.
First of all, cmc_throttle is specified in seconds and there was no
conversion between ticks and seconds when they were mixed together.
Second, we avoid potential problems with ticks wrapping around.
Resolution of time_uptime should be sufficient for the throttling
purposes.
Discussed with: jhb
MFC after: 12 days
Previously, if the threshold was changed, then MC_CTL2_CMCI_EN would get
cleared and the logic would switch to the polling only mode.
Discussed with: jhb
MFC after: 2 weeks
NSS modules are loaded when nsswitch.conf is parsed and may register their
own atexit handlers with libc. nss_atexit() unloads any dynamically loaded
NSS modules, so it should run only after the modules' atexit handlers have
been invoked.
MFC after: 2 weeks
Sponsored by: Dell EMC Isilon
