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Currently we scale the mempool sizes depending on memory installed
in the machine, except for the bio pool itself which sits at a fixed
256 entry pre-allocation.
There's really no point in "optimizing" this OOM path, we just need
enough preallocated to make progress. A single unit is enough, lets
scale it down to 2 just to be on the safe side.
This patch saves ~150kb of pinned kernel memory on a 32-bit box.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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We often lookup the same queue many times in succession, so cache
the last looked up queue to avoid browsing the rbtree.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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To be used by as/cfq as they see fit.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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cfq hash is no more necessary. We always can get cfqq from io context.
cfq_get_io_context_noalloc() function is introduced, because we don't
want to allocate cic on merging and checking may_queue. In order to
identify sync queue we've used hash key = CFQ_KEY_ASYNC. Since hash is
eliminated we need to use other criterion: sync flag for queue is added.
In all places where we dig in rb_tree we're in current context, so no
additional locking is required.
Advantages of this patch: no additional memory for hash, no seeking in
hash, code is cleaner. But it is necessary now to seek cic in per-ioc
rbtree, but it is faster:
- most processes work only with few devices
- most systems have only few block devices
- it is a rb-tree
Signed-off-by: Vasily Tarasov <vtaras@openvz.org>
Changes by me:
- Merge into CFQ devel branch
- Get rid of cfq_get_io_context_noalloc()
- Fix various bugs with dereferencing cic->cfqq[] with offset other
than 0 or 1.
- Fix bug in cfqq setup, is_sync condition was reversed.
- Fix bug where only bio_sync() is used, we need to check for a READ too
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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For tagged devices, allow overlap of requests if the idle window
isn't enabled on the current active queue.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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We don't enable it by default, don't let it get enabled during
runtime.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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We can track it fairly accurately locally, let the slice handling
take care of the rest.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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We don't use it anymore in the slice expiry handling.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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It's only used for preemption now that the IDLE and RT queues also
use the rbtree. If we pass an 'add_front' variable to
cfq_service_tree_add(), we can set ->rb_key to 0 to force insertion
at the front of the tree.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Use the max_slice-cur_slice as the multipler for the insertion offset.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Same treatment as the RT conversion, just put the sorted idle
branch at the end of the tree.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Currently CFQ does a linked insert into the current list for RT
queues. We can just factor the class into the rb insertion,
and then we don't have to treat RT queues in a special way. It's
faster, too.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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For cases where the rbtree is mainly used for sorting and min retrieval,
a nice speedup of the rbtree code is to maintain a cache of the leftmost
node in the tree.
Also spotted in the CFS CPU scheduler code.
Improved by Alan D. Brunelle <Alan.Brunelle@hp.com> by updating the
leftmost hint in cfq_rb_first() if it isn't set, instead of only
updating it on insert.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Drawing on some inspiration from the CFS CPU scheduler design, overhaul
the pending cfq_queue concept list management. Currently CFQ uses a
doubly linked list per priority level for sorting and service uses.
Kill those lists and maintain an rbtree of cfq_queue's, sorted by when
to service them.
This unfortunately means that the ionice levels aren't as strong
anymore, will work on improving those later. We only scale the slice
time now, not the number of times we service. This means that latency
is better (for all priority levels), but that the distinction between
the highest and lower levels aren't as big.
The diffstat speaks for itself.
cfq-iosched.c | 363 +++++++++++++++++---------------------------------
1 file changed, 125 insertions(+), 238 deletions(-)
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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- Move the queue_new flag clear to when the queue is selected
- Only select the non-first queue in cfq_get_best_queue(), if there's
a substantial difference between the best and first.
- Get rid of ->busy_rr
- Only select a close cooperator, if the current queue is known to take
a while to "think".
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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- Implement logic for detecting cooperating processes, so we
choose the best available queue whenever possible.
- Improve residual slice time accounting.
- Remove dead code: we no longer see async requests coming in on
sync queues. That part was removed a long time ago. That means
that we can also remove the difference between cfq_cfqq_sync()
and cfq_cfqq_class_sync(), they are now indentical. And we can
kill the on_dispatch array, just make it a counter.
- Allow a process to go into the current list, if it hasn't been
serviced in this scheduler tick yet.
Possible future improvements including caching the cfqq lookup
in cfq_close_cooperator(), so we don't have to look it up twice.
cfq_get_best_queue() should just use that last decision instead
of doing it again.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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When testing the syslet async io approach, I discovered that CFQ
sometimes didn't perform as well as expected. cfq_should_preempt()
needs to better check for cooperating tasks, so fix that by allowing
preemption of an equal priority queue if the recently queued request
is as good a candidate for IO as the one we are currently waiting for.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Just found a hole in my last patch. It was reported to me that shortly after we
integrated this patch. The report was of an oops that took place inside of
netif_rx when using the sis900 driver. Looking at my origional patch I noted
that there was a spot between the new skb_alloc and the refill_rx_ring label
where skb got reassigned to the pointer currently held in the rx_ring for the
purposes of receiveing the frame. The result of this is however that the buffer
that gets passed to netif_rx (if it is called), then gets placed right back into
the rx_ring. So if you receive frames fast enough the skb being processed by
the network stack can get corrupted. The reporter is testing out the fix I've
written for this below (I'm not near my hardware at the moment to test myself),
but I wanted to post it for review ASAP. I'll post test results when I hear
them, but I think this is a pretty straightforward fix. It just uses a separate
pointer to do the rx operation, so that we don't improperly reassign the pointer
that we use to refill the rx ring.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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Simplify pegasus carrier detection; rely only on the periodic MII
polling. Reverts pieces of c43c49bd61fdb9bb085ddafcaadb17d06f95ec43.
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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This patch converts the pci_module_init() usage to pci_register_driver().
It's currently #if 0'ed, but still not a bad idea to change it.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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Fix miscellaneous networking compilation errors.
(*) Export ktime_add_ns() for modules.
(*) wext_proc_init() should have an ANSI declaration.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Fixes for various arch compilation problems:
(*) Missing module exports.
(*) Variable name collision when rxkad and af_rxrpc both built in
(rxrpc_debug).
(*) Large constant representation problem (AFS_UUID_TO_UNIX_TIME).
(*) Configuration dependencies.
(*) printk() format warnings.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Fix the wakeup transitions after a VLocation record update completes
one way or another. This builds on Dave Miller's partial fix.
Also move wakeups outside the spinlocked sections.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This reverts eefa3906283a2b60a6d02a2cda593a7d7d7946c5
The simplification made in that change works with the assumption that
the 'offset' parameter to these functions is always positive or zero,
which is not true. It can be and often is negative in order to access
SKB header values in front of skb->data.
Signed-off-by: David S. Miller <davem@davemloft.net>
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irqreturn.h for irqreturn_t and dma_addr_t being u128 warnings ;-)
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch provides MTD support for NAND flash devices on CM-x270 modules.
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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Add MAINAINERS and CREDITS entry for Freescale Highspeed USB device
driver.
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Update gadget_chip.c, ether.c for newly added Freescale Highspeed USB
device driver.
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Freescale high-speed USB SOC can be found on some Freescale processors
among different architectures. It supports both host and device functions.
This driver adds its device support for Linux USB Gadget layer.
It is tested on MPC8349 and MPC8313, but should work on other platforms
with minor tweaks. The driver passed USBCV 1.3 compliance tests. Note
that this driver doesn't yet include OTG support.
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Jiang Bo <tanya.jiang@freescale.com>
Signed-off-by: Bruce Schmid <duck@freescale.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Here's a patch which adds my device to the list.
This patch enables the broken suspend quirk for the PCI OHCI controller
present in the IT8152F/G RISC-to-PCI Companion Chip.
Signed-off-by: Raphael Assenat <raph@8d.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The driver uses usb_control_msg() for exchanging data with the device.
When the driver lived freeley _outside_ the kernel tree (pre 2.6.21) the
timeouts for these calls where set to 5*HZ for reading, 1HZ for writing.
(These timeouts seemed to work fine for all users of the driver, at
least nobody complained in the last 2 years.
The current code (2.6.21-rc5) removed the 'HZ' from the timeouts and
left the driver with 5 jiffies for reading and 1 jiffy for writing. My
new machine is fast, but not that fast.
The patch also removes a useless debug statement, which was left over
from testing a broken firmware version
From: Eberhard Fahle <e.fahle@wayoda.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Per the Rui Santos and the hardware manufacturers, this actually inhibits
useful parts of the hardware. The correct way to use this hardware is with the
software at http://www.kanoistika.sk/bobovsky/archiv/umts/ and the manufacturers
are also planning on including Linux drivers/material in future revisions.
CC: Rui Santos <rsantos@grupopie.com>
CC: <johann.wilhelm@student.tugraz.at>
CC: <zihan@huawei.com>
CC: <wanganyu1983@huawei.com>
CC: <dingjianjian@huawei.com>
Signed-off-by: Phil Dibowitz <phil@ipom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Two new device IDs for CP2101 driver.
Signed-off-by: Craig Shelley <craig@microtron.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Hi Greg:
I have found that /drivers/usb/misc/ldusb.c works with the "PICDEM Full
Speed USB"
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en021940
Signed-off-by: Joey S Goncalves <jgoncalves@peragrin.com>
Cc: Michael Hund <MHund@LD-Didactic.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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the memory barrier is needed only with smp.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Remove the old crisv10 HCD ... it can't have built for some time,
doesn't even have a Kconfig entry, was the last driver not to have
been converted to the "hcd" framework, and considering the usbcore
changes since its last patch was merged, has just got to buggy as
all get-out.
I'm told Axis has a new driver, and will be submitting it soon.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Mikael Starvik <mikael.starvik@axis.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Another workaround for the glitch in the network layer, whereby one call
ignores the (otherwise kernel-wide) convention that free() calls should
not oops when passed nulls. This code already handles that API glitch in
most other paths.
From: Erik Hovland <erik@hovland.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This patch (as903) adds a "busnum" sysfs attribute for USB devices.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The device has commands to start/stop the ADSL function, so this adds a
sysfs attribute to allow it to be started/stopped/restarted. It also stops
polling the device for status when the ADSL function is disabled.
There are no problems with sending multiple start or stop commands, even
with a fast loop of them the device still works. There is no need to
protect the restart process from further user actions while it's waiting
for 1.5s.
Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Cc: Duncan Sands <duncan.sands@math.u-psud.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Detect usb device shutdown and ignore failed urbs. This happens when the
driver is unloaded or the device is unplugged.
I'm not sure what other urb statuses should be ignored, and the warning
message doesn't need to be shown when the module is unloaded or the device
is removed.
Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Cc: Duncan Sands <duncan.sands@math.u-psud.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Remove duplicate define of OHCI_QUIRK_ZFMICRO from ftdi-elan.c, its already
defined in drivers/ush/host/ohci.c
Signed-off-by: "S.Caglar Onur" <caglar@pardus.org.tr>
Cc: <tony.olech@elandigitalsystems.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Add the detection for the BandRich BandLuxe C100/C100S/C120 HSDPA Data
Card. With the vendor and product IDs are set properly, the data card can
be detected and works fine.
Signed-off-by: Leon Leong <upleong@bandrich.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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skb_push function may return a pointer which is not aligned as required
by struct rndis_packet_msg_type. Using attribute trick to fix this bug.
Signed-off-by: Roy Huang <roy.huang@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Add checking of driver registration status and release allocated resources
if it failed.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: "Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This should help with any potential NULL pointer usages as reported by a
few users.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Use the new ohci-pci quirk infrastructure to address the problem it was
created to address: a quirk specific to the Portege 4000, in buzilla as
http://bugzilla.kernel.org/show_bug.cgi?id=6723
Also fix a misuse of "__devinit" for the quirk functions. It must not
be used without first ensuring that the references from the quirk tables
are gone, and that the function using those quirk tables is also gone.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Update "usbnet" so that ethtool reports the name of the minidriver in use
(e.g. asix, cdc_ether, dm9601, rndis_host) instead of "usbnet". This is a
better match to how other network drivers work, resolving a minor open issue.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Jens Axboe
Vasily Tarasov
Neil Horman
Dan Williams
Adrian Bunk
David Howells
David S. Miller
Alexey Dobriyan
Mike Rapoport
Li Yang
Raphael Assenat
Eberhard Fahle
Hans Engelen
Phil Dibowitz
Craig Shelley
Joey Goncalves
Oliver Neukum
David Brownell
Erik Hovland
Alan Stern
Simon Arlott
S.Caglar Onur
Leon Leong
Wu, Bryan
Cyrill Gorcunov
Greg Kroah-Hartman