Both are significantly slower than hand-coded loops. See r338963 for
kernel commit.
bcmp differs from memcmp by always returning 1 when a difference is
found, as opposed to going for a value bigger or lower than 0
depending on what it is. This means it can do less work. For now the
code is duplicated and modified. This will get deduplicated after
another round of optimization when memcmp will get a longer-term form.
Both tested with the glibc suite. While the suite does not have a test
for bcmp, I created a wrapper routine which verified that values match
(0 vs 0, 1 vs non-zero).
Reviewed by: kib
Approved by: re (gjb)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17336
once we have a lock, make sure the inp is not marked freed.
This can happen since the list traversal and locking was
converted to epoch(9). If the inp is marked "freed", skip it.
This prevents a NULL pointer deref panic later on.
Reported by: slavash (Mellanox)
Tested by: slavash (Mellanox)
Reviewed by: markj (no formal review but caught my unlock mistake)
Approved by: re (kib)
- remove a forward branch in the common case
- replace xchg + lodsb/stosb loop with simple movs
A simple test on Intel(R) Core(TM) i7-4600U CPU @ 2.10GH copying
/foo/bar/baz in a loop goes from 295715863 ops/s to 465807408.
Further changes are pending.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17281
- move the PSL.AC comment to the fault handler
- stop testing for zero-sized ops. after several minutes of package
building there were no copyin calls with zero bytes and very few
copyout. the semantic of returning 0 in this case is preserved
- shorten exit paths by clearing %eax earlier
- replace xchg with 3 movs. this is what compilers do. a naive
benchmark on EPYC suggests about 1% increase in thoughput thanks to
this change.
- remove the useless movb %cl,%al from copyout. it looks like a
leftover from many years ago
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17286
- Fix "mandoc -Tlint" warnings.
- Use the "Er" macro for errors.
- Add an extra newline for readability.
- Reference m_pullup(9) and m_defrag(9).
- Use the "Fx" macro when talking about FreeBSD versions.
Reviewed by: bcr
Approved by: re (gjb), krion (mentor)
Differential Revision: https://reviews.freebsd.org/D17270
Since r154114 which introduced ldconfig_local32_dirs, ldconfig -32 was
called with -m. This means that ld-elf32.so.hints paths set is not
cleared for compat32 on boot, unlike ld,so,hints. Same -m was used in
r294295 for ld-elf-soft.so.hints on arm. The patch fixes the
asymmetry.
Noted by: Andreas Longwitz <longwitz@incore.de>
Reviewed by: brooks, emaste, imp
Discussed with: bdrewery
Sponsored by: The FreeBSD Foundation
Approved by: re (gjb)
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D17331
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
Create a user view of the ID_AA64PFR0_EL1 register with values common
across all CPUs.
Approved by: re (kib)
Sponsored by: ABT Systems Ltd
Differential Revision: https://reviews.freebsd.org/D17301
Building the kernel in Git repositories when git-svn is not available and
the "help.autocorrect" Git parameter is enabled results in Git trying to
replace the "svn" command (it does not know) with "serve". As a result the
output of the "git server" command is appended to the value of the
environmental variable VERINFO, which causes the auto generated vers.c
file to contain invalid C syntax (missing newline escapes):
#define "@(#)FreeBSD 12.0-ALPHA7 r000eversion 2
0015agent=git/2.19.0
000cls-refs
0012fetch=shallow
0012server-option
0000=5e2272613fa(splash-vt)"
#define VERSTR "FreeBSD 12.0-ALPHA7 r000eversion 2
0015agent=git/2.19.0
000cls-refs
0012fetch=shallow
0012server-option
0000=5e2272613fa(splash-vt)\n"
Using `-c help.autocorrect=0` seems to be a good solution as it does not
modify user's environment. I am not sure, however, if we should use
programs (or Git commands), which we are not sure exist (we never check if
git-svn is available on the host), as there may be more unexpected
behaviors like this one.
Reviewed by: eadler, emaste, krion
Approved by: re (gjb), krion (mentor)
Sponsored by: Bally Wulff Games & Entertainment GmbH
Differential Revision: https://reviews.freebsd.org/D17271
undefined instruction exception. Previously we would exit the guest,
however an unprivileged user could execute these.
Found with: syzkaller
Reviewed by: araujo, tychon (previous version)
Approved by: re (kib)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D17192
search_library_path().
This corrects the scope of libmap matches.
Reported and tested by: Andreas Longwitz <longwitz@incore.de>
Sponsored by: The FreeBSD Foundation
Approved by: re (gjb)
MFC after: 1 week
This is useful when lm_find() moves the match to the global mapping,
since lm_find() could be called with a same path more than once.
Reported and tested by: Andreas Longwitz <longwitz@incore.de>
Sponsored by: The FreeBSD Foundation
Approved by: re (gjb)
MFC after: 1 week
As part of ZFS Crypto, I started getting a series of panics when I did not
have AESNI loaded. Adding locking fixed it, and I concluded that the
Reinit function altered the AES key schedule. This locking is not as
fine-grained as it could be (AESNI uses per-cpu locking), but
it's minimally invasive.
Sponsored by: iXsystems Inc
Reviewed by: cem, mav
Approved by: re (gjb), mav (mentor)
Differential Revision: https://reviews.freebsd.org/D17307
The original spec for the strings describing the PNP info didn't allow
spaces. Several times now people have broken the install by including
them. Relax the syntax to allow them after the ; which is where
people's muscle memory tends to put them.
Approved by: re@ (gjb)
chown incorrectly allows a uid or gid greater than UID_MAX/GID_MAX respectively.
Using such an argument rolls over to accounts such as root, operator, etc.
Approved by: re (gjb)
Relnotes: yes
Reviewed by: cem, kib
Submitted by: Don Morris <dgmorris@earthlink.net>
Sponsored by: Dell EMC
Differential Revision: https://reviews.freebsd.org/D15119
Remove unused and easy to misuse PNP macro parameter
Inspired by r338025, just remove the element size parameter to the
MODULE_PNP_INFO macro entirely. The 'table' parameter is now required to
have correct pointer (or array) type. Since all invocations of the macro
already had this property and the emitted PNP data continues to include the
element size, there is no functional change.
Mostly done with the coccinelle 'spatch' tool:
$ cat modpnpsize0.cocci
@normaltables@
identifier b,c;
expression a,d,e;
declarer MODULE_PNP_INFO;
@@
MODULE_PNP_INFO(a,b,c,d,
-sizeof(d[0]),
e);
@singletons@
identifier b,c,d;
expression a;
declarer MODULE_PNP_INFO;
@@
MODULE_PNP_INFO(a,b,c,&d,
-sizeof(d),
1);
$ rg -l MODULE_PNP_INFO -- sys | \
xargs spatch --in-place --sp-file modpnpsize0.cocci
(Note that coccinelle invokes diff(1) via a PATH search and expects diff to
tolerate the -B flag, which BSD diff does not. So I had to link gdiff into
PATH as diff to use spatch.)
Tinderbox'd (-DMAKE_JUST_KERNELS).
Approved by: re (glen)
Do not call crypto_newsession() while holding xforms_lock mutex.
Release mutex before invoking crypto_newsession(), and use
ipsec_kmod_enter()/ipsec_kmod_exit() functions to protect from doing
access to unloaded kernel module memory.
Move xform-releated functions into subr_ipsec.c to be able use
ipsec_kmod_* functions. Also unconditionally build ipsec_kmod_*
functions, since now they are always used by IPSec code.
Add xf_cntr field to struct xformsw, it is used by ipsec_kmod_*
functions. Also constify xf_name field, since it is not expected to be
modified.
Approved by: re (kib)
Differential Revision: https://reviews.freebsd.org/D17302
The workaround described in the 20180530 entry is no longer required.
Amend that entry and add a new 20180530 entry noting lld is the
default amd64 linker.
Reviewed by: imp
Approved by: re (kib)
From PCI Spec rev 2.2, 6.2.1. Device Identification:
Vendor ID This field identifies the manufacturer of the device. Valid
vendor identifiers are allocated by the PCI SIG to ensure uniqueness.
0FFFFh is an invalid value for Vendor ID.
MFC after: 3 days
Approved by: re (Glen), hselasky (mentor), kib (mentor)
Sponsored by: Mellanox Technologies
dmaplimit is the first byte after the end of DMAP.
Reported by: "Johnson, Archna" <Archna.Johnson@netapp.com>
Reviewed by: alc, markj
Approved by: re (gjb)
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D17318
some TLS bits. This broke operation on the PowerMac. Namely one could not login.
At login the screen/shell was giving back lots of backslashes and the login
shell dumped core.
The fix to this issue is to revert the powerpc commit from 338486 and to
increase the TLS_TCB_SIZE to 16.
Reverting only did not help, login was possible but userland applications
aborted with strange messages.
I tested this patch with world/kernel builds and with port upgrades.
Additionally a full gcc8 bootstrap was successfully completed.
Reviewed by: jhibbits@
Approved by: re (Glen)
For pmap_invalidate_all_pcid(), only reset pm_gen for non-kernel
pmaps, as it was done before the conversion to ifuncs. The reset is
useless but innocent for kernel_pmap. Coverity reported that cpuid is
used uninitialized in this case.
Reported by: cem
Reviewed by: alc, cem, markj
CID: 1395807
Sponsored by: The FreeBSD Foundation
Approved by: re (gjb)
Differential revision: https://reviews.freebsd.org/D17314
Currently vfs calls the root method on each absolute lookup and when
crossing mount points.
zfs_root ends up looking up the inode internally as if it was not
instantianted which results in significant lock contention on systems
like EPYC.
Store the vnode in the mount point and protect the access with rmlocks.
This is a temporary hack for 12.0.
Sample result:
before:
make -s -j 128 buildkernel 2778.09s user 3319.45s system 8370% cpu 1:12.85 total
after:
make -s -j 128 buildkernel 3199.57s user 1772.78s system 8232% cpu 1:00.40 total
Tested by: pho (zfs mount/unmount tests)
Reviewed by: kib, mav, sef (different parts)
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17233
This is a direct commit to a generated file. Simon plans to fix this
upstream before the next import.
PR: 231557
Approved by: re (gjb)
Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
- Switch to using 32b port/link capabilities in the driver. The 32b
format is used internally by firmwares > 1.16.45.0 and the driver will
now interact with the firmware in its native format, whether it's 16b
or 32b. Note that the 16b format doesn't have room for 50G, 200G, or
400G speeds.
- Add a bit in the pause_settings knobs to allow negotiated PAUSE
settings to override manual settings.
- Ensure that manual link settings persist across an administrative
down/up as well as transceiver unplug/replug.
- Remove unused is_*G_port() functions.
Approved by: re@ (gjb@)
MFC after: 1 month
Sponsored by: Chelsio Communications
The PHB4 host bridge used by the POWER9 uses a 64kB range in 32-bit
space at the address 0xffff0000-0xffffffff. Reserve this range so that
DMA memory cannot be allocated within this range. This fixes seemingly
random crashes on a POWER9 system. Ideally this range will have been
reserved by the firmware, but as of now this is not the case.
Submitted by: git_bdragon.rtk0.net
Reviewed by: nwhitehorn
Approved by: re(kib)
Differential Revision: https://reviews.freebsd.org/D17183
Use these predicates instead of inline references to vm_min_domains.
Also add a global all_domains set, akin to all_cpus.
Reviewed by: alc, jeff, kib
Approved by: re (gjb)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17278
When I updated counter definition handling for x86 I broke
'pmccontrol -L' listing counter names. This just changes
pmccontrol to call the library function on x86.
PR: 230984
Approved by: re (kib@)
In 11.x and earlier these were accessible as direct members of 'struct
kinfo_file'. Existing code already knows about the new location of
these members as well, so wrapper macros did not work for these
fields. Instead, define an anonymous struct containing the fields
from 'struct kinfo_file' in FreeBSD 11 that were not part of the
'kf_un' union. This anonymous struct is then placed in an anonymous
union along with the new 'kf_un' union. This preserves the API of
both structure layouts without requiring any wrapper macros.
PR: 231525
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17262
This invokes "fence" on the hart performing the write followed by an IPI
to execute "fence.i" on all harts.
This is required to support userland debuggers setting breakpoints in
user processes.
Reviewed by: br (earlier version), markj
Approved by: re (gjb)
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D17139
redundant, because uma_zone_reserve_kva() is performed on both zones and it
sets this same flag on the zone. (Moreover, the implementation of the swap
pager does not itself require these zones to be UMA_ZONE_NOFREE.)
Reviewed by: kib, markj
Approved by: re (gjb)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D17296
Targets like 'cleandir' must not depend on toolchain capabilities.
Reported by: delphij, Shawn Webb
Approved by: re (kib)
Sponsored by: The FreeBSD Foundation
Currently stats are collected in a MAXCPU-sized array which is not
aligned and suffers enormous false-sharing. Fix the problem by
utilizing per-cpu allocation.
The counter(9) API is not used here as it is too incomplete and does
not provide a win over per-cpu zone sized for malloc stats struct. In
particular stats are being reported for each cpu separately by just
copying what is supposed to be an array element for given cpu.
This eliminates significant false-sharing during malloc-heavy tests
e.g. on Skylake. See the review for details.
Reviewed by: markj
Approved by: re (kib)
Differential Revision: https://reviews.freebsd.org/D17289
syncache_respond(). There is no functional change. The
parameter became unused in r313330, but wasn't removed.
Approved by: re (kib@)
MFC after: 1 month
Sponsored by: Netflix, Inc.
