* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (24 commits)
sched: Cleanup duplicate local variable in [enqueue|dequeue]_task_fair
sched: Replace use of entity_key()
sched: Separate group-scheduling code more clearly
sched: Reorder root_domain to remove 64 bit alignment padding
sched: Do not attempt to destroy uninitialized rt_bandwidth
sched: Remove unused function cpu_cfs_rq()
sched: Fix (harmless) typo 'CONFG_FAIR_GROUP_SCHED'
sched, cgroup: Optimize load_balance_fair()
sched: Don't update shares twice on on_rq parent
sched: update correct entity's runtime in check_preempt_wakeup()
xtensa: Use generic config PREEMPT definition
h8300: Use generic config PREEMPT definition
m32r: Use generic PREEMPT config
sched: Skip autogroup when looking for all rt sched groups
sched: Simplify mutex_spin_on_owner()
sched: Remove rcu_read_lock() from wake_affine()
sched: Generalize sleep inside spinlock detection
sched: Make sleeping inside spinlock detection working in !CONFIG_PREEMPT
sched: Isolate preempt counting in its own config option
sched: Remove pointless in_atomic() definition check
...
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (123 commits)
perf: Remove the nmi parameter from the oprofile_perf backend
x86, perf: Make copy_from_user_nmi() a library function
perf: Remove perf_event_attr::type check
x86, perf: P4 PMU - Fix typos in comments and style cleanup
perf tools: Make test use the preset debugfs path
perf tools: Add automated tests for events parsing
perf tools: De-opt the parse_events function
perf script: Fix display of IP address for non-callchain path
perf tools: Fix endian conversion reading event attr from file header
perf tools: Add missing 'node' alias to the hw_cache[] array
perf probe: Support adding probes on offline kernel modules
perf probe: Add probed module in front of function
perf probe: Introduce debuginfo to encapsulate dwarf information
perf-probe: Move dwarf library routines to dwarf-aux.{c, h}
perf probe: Remove redundant dwarf functions
perf probe: Move strtailcmp to string.c
perf probe: Rename DIE_FIND_CB_FOUND to DIE_FIND_CB_END
tracing/kprobe: Update symbol reference when loading module
tracing/kprobes: Support module init function probing
kprobes: Return -ENOENT if probe point doesn't exist
...
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
rcu: Fix wrong check in list_splice_init_rcu()
net,rcu: Convert call_rcu(xt_rateest_free_rcu) to kfree_rcu()
sysctl,rcu: Convert call_rcu(free_head) to kfree
vmalloc,rcu: Convert call_rcu(rcu_free_vb) to kfree_rcu()
vmalloc,rcu: Convert call_rcu(rcu_free_va) to kfree_rcu()
ipc,rcu: Convert call_rcu(ipc_immediate_free) to kfree_rcu()
ipc,rcu: Convert call_rcu(free_un) to kfree_rcu()
security,rcu: Convert call_rcu(sel_netport_free) to kfree_rcu()
security,rcu: Convert call_rcu(sel_netnode_free) to kfree_rcu()
ia64,rcu: Convert call_rcu(sn_irq_info_free) to kfree_rcu()
block,rcu: Convert call_rcu(disk_free_ptbl_rcu_cb) to kfree_rcu()
scsi,rcu: Convert call_rcu(fc_rport_free_rcu) to kfree_rcu()
audit_tree,rcu: Convert call_rcu(__put_tree) to kfree_rcu()
security,rcu: Convert call_rcu(whitelist_item_free) to kfree_rcu()
md,rcu: Convert call_rcu(free_conf) to kfree_rcu()
* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
lockdep: Fix lockdep_no_validate against IRQ states
mutex: Make mutex_destroy() an inline function
plist: Remove the need to supply locks to plist heads
lockup detector: Fix reference to the non-existent CONFIG_DETECT_SOFTLOCKUP option
sbi->s_mutex isn't needed for isofs at all so we can just remove it. Generally,
since isofs is always mounted read-only, filesystem structure cannot change
under us. So buffer_head contents stays constant after it's filled in. That
leaves us with possible changes of global data structures. Superblock changes
only during filesystem mount (even remount does not change it), inodes are only
filled in during reading from disk. So there are no changes of these structures
to bother about.
Arguments why sbi->s_mutex can be removed at each place:
isofs_readdir: Accesses sb, inode, filp, local variables => s_mutex not needed
isofs_lookup: Protected by directory's i_mutex. Accesses sb, inode, dentry,
local variables => s_mutex not needed
rock_ridge_symlink_readpage: Protected by page lock. Accesses sb, inode,
local variables => s_mutex not needed.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
We don't generate IN_DELETE_SELF on victim of overwriting rename() if
it happens to be a directory. Trivially fixed by doing to ->i_nlink
what we do ->pino_nlink a couple of lines later in jffs2_rename().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
On ramfs and other simple_rename() users IN_DELETE_SELF is not generated
for victim of overwriting rename() if it's is a directory. Works on
most of the local filesystems and really trivial to fix...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Fix build error when CONFIG_BLOCK is not enabled by providing a stub
inode_dio_wait() function.
mm/truncate.c:612: error: implicit declaration of function 'inode_dio_wait'
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
iommu/core: Fix build with INTR_REMAP=y && CONFIG_DMAR=n
iommu/amd: Don't use MSI address range for DMA addresses
iommu/amd: Move missing parts to drivers/iommu
iommu: Move iommu Kconfig entries to submenu
x86/ia64: intel-iommu: move to drivers/iommu/
x86: amd_iommu: move to drivers/iommu/
msm: iommu: move to drivers/iommu/
drivers: iommu: move to a dedicated folder
x86/amd-iommu: Store device alias as dev_data pointer
x86/amd-iommu: Search for existind dev_data before allocting a new one
x86/amd-iommu: Allow dev_data->alias to be NULL
x86/amd-iommu: Use only dev_data in low-level domain attach/detach functions
x86/amd-iommu: Use only dev_data for dte and iotlb flushing routines
x86/amd-iommu: Store ATS state in dev_data
x86/amd-iommu: Store devid in dev_data
x86/amd-iommu: Introduce global dev_data_list
x86/amd-iommu: Remove redundant device_flush_dte() calls
iommu-api: Add missing header file
Fix up trivial conflicts (independent additions close to each other) in
drivers/Makefile and include/linux/pci.h
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: (51 commits)
PM: Improve error code of pm_notifier_call_chain()
PM: Add "RTC" to PM trace time stamps to avoid confusion
PM / Suspend: Export suspend_set_ops, suspend_valid_only_mem
PM / Suspend: Add .suspend_again() callback to suspend_ops
PM / OPP: Introduce function to free cpufreq table
ARM / shmobile: Return -EBUSY from A4LC power off if A3RV is active
PM / Domains: Take .power_off() error code into account
ARM / shmobile: Use genpd_queue_power_off_work()
ARM / shmobile: Use pm_genpd_poweroff_unused()
PM / Domains: Introduce function to power off all unused PM domains
OMAP: PM: disable idle on suspend for GPIO and UART
OMAP: PM: omap_device: add API to disable idle on suspend
OMAP: PM: omap_device: add system PM methods for PM domain handling
OMAP: PM: omap_device: conditionally use PM domain runtime helpers
PM / Runtime: Add new helper function: pm_runtime_status_suspended()
PM / Domains: Queue up power off work only if it is not pending
PM / Domains: Improve handling of wakeup devices during system suspend
PM / Domains: Do not restore all devices on power off error
PM / Domains: Allow callbacks to execute all runtime PM helpers
PM / Domains: Do not execute device callbacks under locks
...
* 'for-linus-core' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (38 commits)
target: Bump version to v4.1.0-rc1-ml
target: remove custom hex2bin() implementation
target: fix typo Assoication -> Association
target: Update QUEUE ALGORITHM MODIFIER control page default
target: ->map_task_SG conversion to ->map_control_SG and ->map_data_SG
target: Follow up core updates from AGrover and HCH (round 4)
target: Eliminate usage of struct se_mem
target: Pass 2nd param of transport_split_cdb by value
target: Enforce 1 page max for control cdb buffer sizes
target: Make all control CDBs scatter-gather
target: Implement Block Device Characteristics VPD page
target: Fix reporting of supported VPD pages
target: Allow for built-in target modules
tcm_fc: Convert to wake_up_process and schedule_timeout_interruptible
tcm_fc: Makefile cleanups
loopback: Fix memory leak in tcm_loop_make_scsi_hba()
loopback: Remove duplicate scsi/scsi_tcq.h include
loopback: off by one in tcm_loop_make_naa_tpg()
target/iblock: Remove unused iblock_dev members
target/iblock: Use request_queue->nr_request for se_device defaults
...
* 'for-3.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
workqueue: separate out drain_workqueue() from destroy_workqueue()
workqueue: remove cancel_rearming_delayed_work[queue]()
* 'ptrace' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc: (39 commits)
ptrace: do_wait(traced_leader_killed_by_mt_exec) can block forever
ptrace: fix ptrace_signal() && STOP_DEQUEUED interaction
connector: add an event for monitoring process tracers
ptrace: dont send SIGSTOP on auto-attach if PT_SEIZED
ptrace: mv send-SIGSTOP from do_fork() to ptrace_init_task()
ptrace_init_task: initialize child->jobctl explicitly
has_stopped_jobs: s/task_is_stopped/SIGNAL_STOP_STOPPED/
ptrace: make former thread ID available via PTRACE_GETEVENTMSG after PTRACE_EVENT_EXEC stop
ptrace: wait_consider_task: s/same_thread_group/ptrace_reparented/
ptrace: kill real_parent_is_ptracer() in in favor of ptrace_reparented()
ptrace: ptrace_reparented() should check same_thread_group()
redefine thread_group_leader() as exit_signal >= 0
do not change dead_task->exit_signal
kill task_detached()
reparent_leader: check EXIT_DEAD instead of task_detached()
make do_notify_parent() __must_check, update the callers
__ptrace_detach: avoid task_detached(), check do_notify_parent()
kill tracehook_notify_death()
make do_notify_parent() return bool
ptrace: s/tracehook_tracer_task()/ptrace_parent()/
...
* 'of-pci' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
pci/of: Consolidate pci_bus_to_OF_node()
pci/of: Consolidate pci_device_to_OF_node()
x86/devicetree: Use generic PCI <-> OF matching
microblaze/pci: Move the remains of pci_32.c to pci-common.c
microblaze/pci: Remove powermac originated cruft
pci/of: Match PCI devices to OF nodes dynamically
* 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6:
dt: include linux/errno.h in linux/of_address.h
of/address: Add of_find_matching_node_by_address helper
dt: remove extra xsysace platform_driver registration
tty/serial: Add devicetree support for nVidia Tegra serial ports
dt: add empty of_property_read_u32[_array] for non-dt
dt: bindings: move SEC node under new crypto/
dt: add helper function to read u32 arrays
tty/serial: change of_serial to use new of_property_read_u32() api
dt: add 'const' for of_property_read_string parameter **out_string
dt: add helper functions to read u32 and string property values
tty: of_serial: support for 32 bit accesses
dt: document the of_serial bindings
dt/platform: allow device name to be overridden
drivers/amba: create devices from device tree
dt: add of_platform_populate() for creating device from the device tree
dt: Add default match table for bus ids
* 'spi/next' of git://git.secretlab.ca/git/linux-2.6: (34 commits)
spi/imx: add device tree probe support
spi/imx: copy gpio number passed by platform data into driver private data
spi/imx: use soc name in spi device type naming scheme
spi/imx: merge type SPI_IMX_VER_0_7 into SPI_IMX_VER_0_4
spi/imx: do not use spi_imx2_3 to name SPI_IMX_VER_2_3 function and macro
spi/imx: use mx21 to name SPI_IMX_VER_0_0 function and macro
spi/imx: do not make copy of spi_imx_devtype_data
spi/dw: Add spi number into spi irq desc
spi/tegra: Use engineering names in DT compatible property
spi/fsl_spi: fix CPM spi driver
mach-s3c2410: remove unused spi-gpio.h file
spi: remove obsolete spi-s3c24xx-gpio driver
mach-gta2: remove unused spi-gpio.h include
mach-qt2410: convert to spi_gpio
mach-jive: convert to spi_gpio
spi/pxa2xx: Remove unavailable ssp_type from documentation
spi/bfin_spi: uninline fat queue funcs
spi/bfin_spi: constify pin array
spi/bfin_spi: use structs for accessing hardware regs
spi/topcliff-pch: Support new device ML7223 IOH
...
Fix up trivial conflict in arch/arm/mach-ep93xx/Makefile
* 'gpio/next' of git://git.secretlab.ca/git/linux-2.6: (61 commits)
gpio/mxc/mxs: fix build error introduced by the irq_gc_ack() renaming
mcp23s08: add i2c support
mcp23s08: isolate spi specific parts
mcp23s08: get rid of setup/teardown callbacks
gpio/tegra: dt: add binding for gpio polarity
mcp23s08: remove unused work queue
gpio/da9052: remove a redundant assignment for gpio->da9052
gpio/mxc: add device tree probe support
ARM: mxc: use ARCH_NR_GPIOS to define gpio number
gpio/mxc: get rid of the uses of cpu_is_mx()
gpio/mxc: add missing initialization of basic_mmio_gpio shadow variables
gpio: Move mpc5200 gpio driver to drivers/gpio
GPIO: DA9052 GPIO module v3
gpio/tegra: Use engineering names in DT compatible property
of/gpio: Add new method for getting gpios under different property names
gpio/dt: Refine GPIO device tree binding
gpio/ml-ioh: fix off-by-one for displaying variable i in dev_err
gpio/pca953x: Deprecate meaningless device-tree bindings
gpio/pca953x: Remove dynamic platform data pointer
gpio/pca953x: Fix IRQ support.
...
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: (26 commits)
IB/qib: Defer HCA error events to tasklet
mlx4_core: Bump the driver version to 1.0
RDMA/cxgb4: Use printk_ratelimited() instead of printk_ratelimit()
IB/mlx4: Support PMA counters for IBoE
IB/mlx4: Use flow counters on IBoE ports
IB/pma: Add include file for IBA performance counters definitions
mlx4_core: Add network flow counters
mlx4_core: Fix location of counter index in QP context struct
mlx4_core: Read extended capabilities into the flags field
mlx4_core: Extend capability flags to 64 bits
IB/mlx4: Generate GID change events in IBoE code
IB/core: Add GID change event
RDMA/cma: Don't allow IPoIB port space for IBoE
RDMA: Allow for NULL .modify_device() and .modify_port() methods
IB/qib: Update active link width
IB/qib: Fix potential deadlock with link down interrupt
IB/qib: Add sysfs interface to read free contexts
IB/mthca: Remove unnecessary read of PCI_CAP_ID_EXP
IB/qib: Remove double define
IB/qib: Remove unnecessary read of PCI_CAP_ID_EXP
...
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1287 commits)
icmp: Fix regression in nexthop resolution during replies.
net: Fix ppc64 BPF JIT dependencies.
acenic: include NET_SKB_PAD headroom to incoming skbs
ixgbe: convert to ndo_fix_features
ixgbe: only enable WoL for magic packet by default
ixgbe: remove ifdef check for non-existent define
ixgbe: Pass staterr instead of re-reading status and error bits from descriptor
ixgbe: Move interrupt related values out of ring and into q_vector
ixgbe: add structure for containing RX/TX rings to q_vector
ixgbe: inline the ixgbe_maybe_stop_tx function
ixgbe: Update ATR to use recorded TX queues instead of CPU for routing
igb: Fix for DH89xxCC near end loopback test
e1000: always call e1000_check_for_link() on e1000_ce4100 MACs.
netxen: add fw version compatibility check
be2net: request native mode each time the card is reset
ipv4: Constrain UFO fragment sizes to multiples of 8 bytes
virtio_net: Fix panic in virtnet_remove
ipv6: make fragment identifications less predictable
ipv6: unshare inetpeers
can: make function can_get_bittiming static
...
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
lguest: Fix in/out emulation
lguest: Fix translation count about wikipedia's cpuid page
lguest: Fix three simple typos in comments
lguest: update comments
lguest: Simplify device initialization.
lguest: don't rewrite vmcall instructions
lguest: remove remaining vmcall
lguest: use a special 1:1 linear pagetable mode until first switch.
lguest: Do not exit on non-fatal errors
* 'stable/drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/pciback: Have 'passthrough' option instead of XEN_PCIDEV_BACKEND_PASS and XEN_PCIDEV_BACKEND_VPCI
xen/pciback: Remove the DEBUG option.
xen/pciback: Drop two backends, squash and cleanup some code.
xen/pciback: Print out the MSI/MSI-X (PIRQ) values
xen/pciback: Don't setup an fake IRQ handler for SR-IOV devices.
xen: rename pciback module to xen-pciback.
xen/pciback: Fine-grain the spinlocks and fix BUG: scheduling while atomic cases.
xen/pciback: Allocate IRQ handler for device that is shared with guest.
xen/pciback: Disable MSI/MSI-X when reseting a device
xen/pciback: guest SR-IOV support for PV guest
xen/pciback: Register the owner (domain) of the PCI device.
xen/pciback: Cleanup the driver based on checkpatch warnings and errors.
xen/pciback: xen pci backend driver.
xen: tmem: self-ballooning and frontswap-selfshrinking
xen: Add module alias to autoload backend drivers
xen: Populate xenbus device attributes
xen: Add __attribute__((format(printf... where appropriate
xen: prepare tmem shim to handle frontswap
xen: allow enable use of VGA console on dom0
* 'stable/pci.cleanups.v1' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/pci: Use 'acpi_gsi_to_irq' value unconditionally.
xen/pci: Remove 'xen_allocate_pirq_gsi'.
xen/pci: Retire unnecessary #ifdef CONFIG_ACPI
xen/pci: Move the allocation of IRQs when there are no IOAPIC's to the end
xen/pci: Squash pci_xen_initial_domain and xen_setup_pirqs together.
xen/pci: Use the xen_register_pirq for HVM and initial domain users
xen/pci: In xen_register_pirq bind the GSI to the IRQ after the hypercall.
xen/pci: Provide #ifdef CONFIG_ACPI to easy code squashing.
xen/pci: Update comments and fix empty spaces.
xen/pci: Shuffle code around.
* 'for-linus' of git://oss.sgi.com/xfs/xfs: (49 commits)
xfs: add size update tracepoint to IO completion
xfs: convert AIL cursors to use struct list_head
xfs: remove confusing ail cursor wrapper
xfs: use a cursor for bulk AIL insertion
xfs: failure mapping nfs fh to inode should return ESTALE
xfs: Remove the second parameter to xfs_sb_count()
xfs: remove the dead XFS_DABUF_DEBUG code
xfs: remove leftovers of the old btree tracing code
xfs: remove the dead QUOTADEBUG code
xfs: remove the unused xfs_buf_delwri_sort function
xfs: remove wrappers around b_iodone
xfs: remove wrappers around b_fspriv
xfs: add a proper transaction pointer to struct xfs_buf
xfs: factor out xfs_da_grow_inode_int
xfs: factor out xfs_dir2_leaf_find_stale
xfs: cleanup struct xfs_dir2_free
xfs: reshuffle dir2 headers
xfs: start periodic workers later
Revert "xfs: fix filesystsem freeze race in xfs_trans_alloc"
xfs: remove variables that serve no purpose in xfs_alloc_ag_vextent_exact()
...
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
dlm: don't limit active work items
dlm: use workqueue for callbacks
dlm: remove deadlock debug print
dlm: improve rsb searches
dlm: keep lkbs in idr
dlm: fix kmalloc args
dlm: don't do pointless NULL check, use kzalloc and fix order of arguments
dlm: dump address of unknown node
dlm: use vmalloc for hash tables
dlm: show addresses in configfs
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/hfsplus:
hfsplus: ensure bio requests are not smaller than the hardware sectors
hfsplus: Add additional range check to handle on-disk corruptions
hfsplus: Add error propagation for hfsplus_ext_write_extent_locked
hfsplus: add error checking for hfs_find_init()
hfsplus: lift the 2TB size limit
hfsplus: fix overflow in hfsplus_read_wrapper
hfsplus: fix overflow in hfsplus_get_block
hfsplus: assignments inside `if' condition clean-up
* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw:
GFS2: combine duplicated block freeing routines
GFS2: Add S_NOSEC support
GFS2: Automatically adjust glock min hold time
GFS2: Cache dir hash table in a contiguous buffer
* 'linux-next' of git://git.infradead.org/ubi-2.6:
UBI: clarify the volume notification types' doc
UBI: remove dead code
UBI: dump stack when switching to R/O mode
UBI: fix oops in error path
UBI: switch debugging tests knobs to debugfs
UBI: make it possible to use struct ubi_device in debug.h
UBI: prepare debugging stuff to further debugfs conversion
UBI: use debugfs for the extra checks knobs
UBI: change the interface of a debugging check function
* 'linux-next' of git://git.infradead.org/ubifs-2.6: (32 commits)
MAINTAINERS: change e-mail of Adrian Hunter
UBIFS: fix master node recovery
UBIFS: improve power cut emulation testing
UBIFS: rename recovery testing variables
UBIFS: remove custom list of superblocks
UBIFS: stop re-defining UBI operations
UBIFS: switch to I/O helpers
UBIFS: switch to ubifs_leb_write
UBIFS: switch to ubifs_leb_read
UBIFS: introduce more I/O helpers
UBIFS: always print stacktrace when switching to R/O mode
UBIFS: remove unused and unneeded debugging function
UBIFS: add global debugfs knobs
UBIFS: introduce debugfs helpers
UBIFS: re-arrange debugging code a bit
UBIFS: be more informative in failure mode
UBIFS: switch self-check knobs to debugfs
UBIFS: lessen amount of debugging check types
UBIFS: introduce helper functions for debugging checks and tests
UBIFS: amend debugging inode size check function prototype
...
With ib_qib options:
options ib_qib krcvqs=1 pcie_caps=0x51 rcvhdrcnt=4096 singleport=1 ibmtu=4
a run of ib_write_bw -a yields the following:
------------------------------------------------------------------
#bytes #iterations BW peak[MB/sec] BW average[MB/sec]
1048576 5000 2910.64 229.80
------------------------------------------------------------------
The top cpu use in a profile is:
CPU: Intel Architectural Perfmon, speed 2400.15 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask
of 0x00 (No unit mask) count 1002300
Counted LLC_MISSES events (Last level cache demand requests from this core that
missed the LLC) with a unit mask of 0x41 (No unit mask) count 10000
samples % samples % app name symbol name
15237 29.2642 964 17.1195 ib_qib.ko qib_7322intr
12320 23.6618 1040 18.4692 ib_qib.ko handle_7322_errors
4106 7.8860 0 0 vmlinux vsnprintf
Analysis of the stats, profile, the code, and the annotated profile indicate:
- All of the overflow interrupts (one per packet overflow) are
serviced on CPU0 with no mitigation on the frequency.
- All of the receive interrupts are being serviced by CPU0. (That is
the way truescale.cmds statically allocates the kctx IRQs to CPU)
- The code is spending all of its time servicing QIB_I_C_ERROR
RcvEgrFullErr interrupts on CPU0, starving the packet receive
processing.
- The decode_err routine is very inefficient, using a printf variant
to format a "%s" and continues to loop when the errs mask has been
cleared.
- Both qib_7322intr and handle_7322_errors read pci registers, which
is very inefficient.
The fix does the following:
- Adds a tasklet to service QIB_I_C_ERROR
- Replaces the very inefficient scnprintf() with a memcpy(). A field
is added to qib_hwerror_msgs to save the sizeof("string") at
compile time so that a strlen is not needed during err_decode().
- The most frequent errors (Overflows) are serviced first to exit the
loop as early as possible.
- The loop now exits as soon as the errs mask is clear rather than
fruitlessly looping through the msp array.
With this fix the performance changes to:
------------------------------------------------------------------
#bytes #iterations BW peak[MB/sec] BW average[MB/sec]
1048576 5000 2990.64 2941.35
------------------------------------------------------------------
During testing of the error handling overflow patch, it was determined
that some CPU's were slower when servicing both overflow and receive
interrupts on CPU0 with different MSI interrupt vectors.
This patch adds an option (krcvq01_no_msi) to not use a dedicated MSI
interrupt for kctx's < 2 and to service them on the default interrupt.
For some CPUs, the cost of the interrupt enter/exit is more costly
than then the additional PCI read in the default handler.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Adds README file, TODO list, and a couple of other pieces that didn't seem
to fit into any other patch.
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
