Although we perform path compression to reduce the height of the trie and
the number of interior nodes, we have previously created a level zero
interior node at the root of every non-empty trie, even when that node is
not strictly necessary, i.e., it has only one child. This change is the
second (and final) step in eliminating those unnecessary level zero interior
nodes. Specifically, it updates the deletion and insertion functions so
that they do not require a level zero interior node at the root of the trie.
For a "buildworld" workload, this change results in a 16.8% reduction in the
number of interior nodes allocated and a similar reduction in the average
execution time for lookup functions. For example, the average execution
time for a call to vm_radix_lookup_ge() is reduced by 22.9%.
MFV r249496,249498. The most visible change is that we no longer shuts
down the connection when stdin closes, by default. This matches Hobbit's
original netcat and GNU netcat.
Old behavior can be restored with the new -N flag.
Re-factor the code to provide kern_proc_filedesc_out(), kern_proc_out(),
and kern_proc_vmmap_out() functions to output process kinfo structures
to sbuf, to make the code reusable.
The functions are going to be used in the coredump routine to store
procstat info in the core program header notes.
Re-factor coredump routines. For each type of notes an output
function is provided, which is used either to calculate the note size
or output it to sbuf. On the first pass the notes are registered in a
list and the resulting size is found, on the second pass the list is
traversed outputing notes to sbuf. For the sbuf a drain routine is
provided that writes data to a core file.
The main goal of the change is to make coredump to write notes
directly to the core file, without preliminary preparing them all in a
memory buffer. Storing notes in memory is not a problem for the
current, rather small, set of notes we write to the core, but it may
becomes an issue when we start to store procstat notes.
Print MB and GB instead of MiB and GiB mislabeled as MB and GB.
SD cards are sold in GB not GiB, this will result in less confusion.
Also, cache parent device pointer to save a few cycles for loops.
Usnure that PCI bus BIS_GET_DMA_TAG() method sees the actual PCI
device which makes the request for dma tag, instead of some descendant
of the PCI device, by creating a pass-through trampoline for vga_pci
and ata_pci buses.
Sponsored by: The FreeBSD Foundation
Suggested by: jhb
Discussed with: jhb, mav
MFC after: 1 week
MFprojects/camlock r248982:
Stop abusing xpt_periph in random plases that really have no periph related
to CCB, for example, bus scanning. NULL value is fine in such cases and it
is correctly logged in debug messages as "noperiph". If at some point we
need some real XPT periphs (alike to pmpX now), quite likely they will be
per-bus, and not a single global instance as xpt_periph now.
Remove multilevel freezing mechanism, implemented to handle specifics of
the ATA/SATA error recovery, when post-reset recovery commands should be
allocated when queues are already full of payload requests. Instead of
removing frozen CCBs with specified range of priorities from the queue
to provide free openings, use simple hack, allowing explicit CCBs over-
allocation for requests with priority higher (numerically lower) then
CAM_PRIORITY_OOB threshold.
Simplify CCB allocation logic by removing SIM-level allocation queue.
After that SIM-level queue manages only CCBs execution, while allocation
logic is localized within each single device.
In some cases, kern_envp is set by the architecture code and env_pos does
not contain the length of the static kernel environment. In these cases
r249408 causes the kernel to discard the environment.
Fix this by updating the check for empty static env to *kern_envp != '\0'
Although we perform path compression to reduce the height of the trie and
the number of interior nodes, we always create a level zero interior node at
the root of every non-empty trie, even when that node is not strictly
necessary, i.e., it has only one child. This change is the first step in
eliminating those unnecessary level zero interior nodes. Specifically, it
updates all of the lookup functions so that they do not require a level zero
interior node at the root.
Dtrace: resolve const types from fbt and other fixes.
Merge change from illumos:
3519 DTrace fails to resolve const types from fbt
3520 dtrace internal error -- token type 316 is not a valid D
compilation token
3521 clean up dtrace unit tests
This includes a new IOCTL to support a generic method for nvmecontrol(8) to pass
IDENTIFY, GET_LOG_PAGE, GET_FEATURES and other commands to the controller, rather than
separate IOCTLs for each.
Remove the NVMe-specific physio and associated routines.
These were added early on for benchmarking purposes to avoid the mapped I/O
penalties incurred in kern_physio. Now that FreeBSD (including kern_physio)
supports unmapped I/O, the need for these NVMe-specific routines no longer exists.
Move MIPS_MAX_TLB_ENTRIES definition from cpuregs.h to tlb.c
Having MIPS_MAX_TLB_ENTRIES defined to 128 is misleading, since it used
to be 64 in older releases of MIPS architecture (where it could be read
from Config1) and can be much more than 128 for the newer processors.
For now, move the definition to the only file using it (mips/mips/tlb.c)
and define MIPS_MAX_TLB_ENTRIES depending on the MIPS cpu defined. Also
add few checks so that we do not write beyond the end of the tlb_state
array.
This fixes a kernel data corruption seen in Netlogic XLP, which was casued
by tlb_save() writing beyond the end of tlb_state array when breaking into
debugger.
Remove ctl(4) from GENERIC. Also remove 'options CTL_DISABLE'
and kern.cam.ctl.disable tunable; those were introduced as a workaround
to make it possible to boot GENERIC on low memory machines.
With ctl(4) being built as a module and automatically loaded by ctladm(8),
this makes CTL work out of the box.
Fix kenv behavior when there is no static environment
In case where there are no static kernel environment entries, the
function init_dynamic_kenv() adds an incorrect entry at position 0 of
the dynamic kernel environment. This in turn causes kenv(1) to print
and empty list even though there are dynamic entries added later.
Fix this by checking env_pos in init_dynamic_kenv() and adding dynamic
entries only if there are static entries.
- Do not bail out if stat(2) fails with ENOENT in the spool directory. This
happens if another atrm process removes a job while we're scanning through
the directory.
- While at it, optimize a bit the directory scanning, so that we quit looping
as soon as all jobs specified in argv have been dealt with.
Update with several early mentor/mentee relationships and dates commit
bits were granted. Relationships have been provided by the mentees,
dates have been sourced from either the mentees or the CVS mailing list
archives.
ken [Thu, 11 Apr 2013 21:18:04 +0000 (21:18 +0000)]
Fix bugs in the elapsed time calculation in ctlstat_standard()
pointed out by bde:
- Casting to long double isn't needed.
- The division isn't needed, multiplication can be used.
"When 1 nanosecond is in a floating point literal, the whole
expression is automatically promoted correctly."
- non-KNF indentation (1 tab) for the newly split line
- different non-KNF indentation (5 spaces) for the previously split
line
- exessive parentheses around the division operation
- bogus blank line which splits up the etime initialization
- general verboseness from the above.
Fix tcp_output() so that tcpcb is updated in the same manner when an
mbuf allocation fails, as in a case when ip_output() returns error.
To achieve that, move large block of code that updates tcpcb below
the out: label.
This fixes a panic, that requires the following sequence to happen:
1) The SYN was sent to the network, tp->snd_nxt = iss + 1, tp->snd_una = iss
2) The retransmit timeout happened for the SYN we had sent,
tcp_timer_rexmt() sets tp->snd_nxt = tp->snd_una, and calls tcp_output().
In tcp_output m_get() fails.
3) Later on the SYN|ACK for the SYN sent in step 1) came,
tcp_input sets tp->snd_una += 1, which leads to
tp->snd_una > tp->snd_nxt inconsistency, that later panics in
socket buffer code.
For reference, this bug fixed in DragonflyBSD repo:
3021 option for time-ordered output from dtrace(1M)
3022 DTrace: keys should not affect the sort order when sorting by value
3023 it should be possible to dereference dynamic variables
3024 D integer narrowing needs some work
3025 register leak in D code generation
3026 libdtrace should set LD_NOLAZYLOAD=1 to help the pid provider
This brings yet another feature implemented in upstream DTrace.
A complete description is available here:
http://dtrace.org/blogs/ahl/2012/07/28/my-new-dtrace-favorite/
This change bumps the DT_VERS_* number to 1.9.1 in
accordance to what is done in illumos.
This change was somewhat complicated because upstream is mixed many
changes in an individual commit and some of the tests don't really
apply to us.
There are also appear to be differences in timestamping with Solaris
so we had to workaround some assertions making sure no regression
happened.
Special thanks to Fabian Keil for changes and testing.
mm [Thu, 11 Apr 2013 07:49:16 +0000 (07:49 +0000)]
Fix libzfs to report error instead of returning zero if trying to hold or
release a non-existing snapshot of a existing dataset. In recursive case
error is reported if no snapshots with the requested name have been found.
Problem and proposed solution reported to illumos:
3699 zfs hold or release of a non-existent snapshot does not output error
Do not sent 120 TEST UNIT READY requests on generic NOT READY statuses.
Some failing disks tend to return vendor-specific ASC/ASCQ codes with
NOT READY sense key. It caused extremely long recovery attempts, repeating
these 120 TURs (it takes at least 1 minute) for every I/O request.
Instead of that use default error handling, doing just few retries.
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