suspension code. When a thread A is going to sleep, it calls
sleepq_catch_signals() to detect any pending signals or thread
suspension request, if nothing happens, it returns without
holding process lock or scheduler lock, this opens a race
window which allows thread B to come in and do process
suspension work, however since A is still at running state,
thread B can do nothing to A, thread A continues, and puts
itself into actually sleeping state, but B has never seen it,
and it sits there forever until B is woken up by other threads
sometimes later(this can be very long delay or never
happen). Fix this bug by forcing sleepq_catch_signals to
return with scheduler lock held.
Fix sleepq_abort() by passing it an interrupted code, previously,
it worked as wakeup_one(), and the interruption can not be
identified correctly by sleep queue code when the sleeping
thread is resumed.
Let thread_suspend_check() returns EINTR or ERESTART, so sleep
queue no longer has to use SIGSTOP as a hack to build a return
value.
Reviewed by: jhb
MFC after: 1 week
and it has not plenty of free pages it tries to free pages in the cache queue.
Unfortunately freeing a cached page requires the locking of the object that
owns the page. However in the context of allocating pages we may not be able
to lock the object and thus can only TRY to lock the object. If the locking try
fails the cache page can not be freed and is activated to move it out of the way
so that we may try to free other cache pages.
If all pages in the cache belong to objects that are currently locked the
cache queue can be emptied without freeing a single page. This scenario caused
two problems:
1) vm_page_alloc always failed allocation when it tried freeing pages from
the cache queue and failed to do so. However if there are more than
cnt.v_interrupt_free_min pages on the free list it should return pages
when requested with priority VM_ALLOC_SYSTEM. Failure to do so can cause
resource exhaustion deadlocks.
2) Threads than need to allocate pages spend a lot of time cleaning up the
page queue without really getting anything done while the pagedaemon
needs to work overtime to refill the cache.
This change fixes the first problem. (1)
Reviewed by: tegge@
- In em_attach() remove em_check_for_link(). Not needed here, since
already done in em_hardware_init().
- In em_attach() replace the printing block with call to
em_update_link_status().
- Remove modification of sc->link_state from em_hardware_init() and
from em_media_status(). This makes em_update_link_status() a
single point of change. Call em_update_link_status() where needed.
to getting rid u_int for uint and so on).
b) Turn back on 64 bit DAC support. Cheeze it a bit in that we have two
DMA callback functions- one when we have bus_addr_t > 4 bits in width and
the other which should be normal. Even Cheezier in that we turn off setting
up DMA maps to be BUS_SPACE_MAXADDR if we're in ISP_TARGET_MODE. More work
on this in a week or so.
c) Tested under amd64 and 1MB DFLTPHYS, sparc64, i386 (PAE, but insufficient
memory to really test > 4GB). LINT check under amd64.
MFC after: 1 month
ENABLE_WPA_SUPPLICANT_EAPOL is no more, now use NO_WPA_SUPPLICANT_EAPOL
to build with only WPA-PSK support.
Reviewed by: ru, bsdimp (basic approach)
MFC after: 1 week
with methods: instead of honoring non-zero values expect drivers
to write their own values on return from ieee80211_ifattach
o add a define for the default h/w bmiss count
MFC after: 2 weeks
pages, not a count of bytes. The sysctl handler for hw.realmem already
uses ctob() to convert realmem from pages to bytes. Thus, on archs that
were storing a byte count in the realmem variable, hw.realmem was inflated.
Reported by: Valerio daelli valerio dot daelli at gmail dot com (alpha)
MFC after: 3 days
3 columns were wasted at the left, except these columns were used to
make the header line up. Now there is no space on the same line for
the "Proc:" part of the header. Try putting this on the line above
although it clutters that line (there is already similar clutter for
the "Interrupts" header). Leave 1 column between these fields. With
the above and a previous change there is enough of space for this.
Use 5 columns instead of 3 for the number of users since 3 is not quite
enough and there was space to spare. This also fixes an off-by-2 error
in a previous fix forthe column count in the comment on STATROW.
Move all the pager fields 1 to the right so that the "count" and "pages"
descriptors more clearly apply to the pager fields and not the memory
fields. There was space to space.
Waste some of the spare space at the right of the pager fields to expand
all the pager field widths to their old values (but now with a column
between the fields). There are fields more in need of expansion but most
of them are not in places near spare space.
made it unnecessary. (Rev.1.6 had to reduce the field width to 4, and
changed 100.0 and preposterous larger values down to 99.9 since 100.0
wouldn't have fitted. Rev.1.35 handles precentages > 99.9 well enough by
changing the format to %.0f when the string given by the initial format
is too wide.)
Even with this change, during short testing I've never seen a percentage
of 100 being displayed by systat -v, although top(1) displays percentages
of 100 user or 100 idle for similar loads.
Always use snprintf()'s return value, since discarding it is a style
bug at best and using it here gives slightly simpler code and better
error checking. Use snprintf() in putlongdouble() the same as in
putfloat(). (1.25 changed most sprintf()'s to snprintf()'s to fix
non-bugs without changing the logic to use the result of snprintf();
1.27 restored one of the sprintf()s by cloning a stale version of
putfloat().)
Don't print a too-long field in the unlikely case that the fallback
to M units in putint() leaves the field still too long. (The fallback
to printing stars was lost in rev.1.58 when the fallback to M units
was added.)
cannot run into other fields or field descriptors. If the value is
too large to fit in the field width, then the output format is adjusted
so that the value (usually) fits, but with fields running together
externally this adjustment usually didn't help. Mostly it doesn't
matter to lose 1 digit of precision, but switching the output format
is bad if it happens often or gives bogus units. The loss of width
is most serious for fields near "Csw" (which are also the ones which
must often ran together) since these have a high variance and large
values relative to the possible field widths so the switch occurs more
often now, and for the memory size fields where the switch gives the
bogus units kKB or MKB.
Now only the fields for r, p, d, s and w can run into each other.
These fields have width 3, and 3 cannot be reduced to 2 without losing
all precision when the value is between 100 and 999.
Trim "pdwake" to "pdwak" at think time now that it doesn't get clobbered
at runtime. The manpage doesn't need to be changed for this because
it documents the clobbered descriptor, unlike for 4 other too-long
descriptors which only get clobbered if there are lots of interrupt
sources.
Trim "% busy" to "%busy" since most other descriptors for percentages
are spelled without the space and this change makes changing the widths
of the %busy fields unnecessary.
around PUTRATE() because PUTRATE() only looked like a function -- it was
multiple statements. Use "do {...} while(0)" as usual in PUTRATE() so
that it is a single statement that can be used like a function.
large. In most cases it is still 1 too large, so fields tend to run
together, but in the following cases it was more than 1 too large, and
the starting column was too small too, so the field started inside the
previous field or descriptor and clobbered that:
- "wire": the number for this overwrote 2 characters of the number for
"Flt". Reduce the field width by 3 (2 to avoid the overwrite and 1
so that the fields don't run together). This was already done for
the preceding number for "cow".
- "inact": the number for this overwrote 1 character of the descriptor
"Idle". Reducing the field width by 2 is enough.
- "cache:" the number for this overwrote 3 characters of the scale
"...| |". The field width should be reduced by 4 to keep things
from running together, but that is a lot and not so necessary here
since the final "|" in the scale serves as a delimiter. Only reduce
it by 3.
- "free": the number for this overwrote 2 characters of the bar graph.
The character position under the final "|" in the scale is apparently
not used, so reducing the field width by 3 is enough.
When "zfod" is in the main vmstat display:
- use the normal field width of 9 (not 5) for it since there is no shortage
of space. Fix style bugs (excessive {}) in the statement that
conditionally writes it.
Write all reduced field widths for vmstat fields as "9 - <reduction>" as
a hint that we don't want to reduce them.
it so that ip_id etc. don't get overwritten. This fixes forwarding
of fragmented IP packets through a dummynet pipe -- fragments came
out with modified and different(!) ip_id's, making it impossible to
reassemble a datagram at the receiver side.
Submitted by: Alexander Karptsov (reworked by me)
MFC after: 3 days
number in more cases by stealing 2 characters from the count field to
give more space in the descriptor field, but it did the column adjustments
for this strangely using an off-by-2 error in the base column and
compensating off-by-2 errors in 6 offsets from the base column (4 new
errors and 2 from not changing the offsets that actually changed).
Print the "Interrupts" header directly at its offset from the base column
instead of spacing it half using the offset and half by printing a space
character.
