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Caleb Sander Mateos 0ac2043741 mlx5/core: Schedule EQ comp tasklet only if necessary 
Currently, the mlx5_eq_comp_int() interrupt handler schedules a tasklet
to call mlx5_cq_tasklet_cb() if it processes any completions. For CQs
whose completions don't need to be processed in tasklet context, this
adds unnecessary overhead. In a heavy TCP workload, we see 4% of CPU
time spent on the tasklet_trylock() in tasklet_action_common(), with a
smaller amount spent on the atomic operations in tasklet_schedule(),
tasklet_clear_sched(), and locking the spinlock in mlx5_cq_tasklet_cb().
TCP completions are handled by mlx5e_completion_event(), which schedules
NAPI to poll the queue, so they don't need tasklet processing.

Schedule the tasklet in mlx5_add_cq_to_tasklet() instead to avoid this
overhead. mlx5_add_cq_to_tasklet() is responsible for enqueuing the CQs
to be processed in tasklet context, so it can schedule the tasklet. CQs
that need tasklet processing have their interrupt comp handler set to
mlx5_add_cq_to_tasklet(), so they will schedule the tasklet. CQs that
don't need tasklet processing won't schedule the tasklet. To avoid
scheduling the tasklet multiple times during the same interrupt, only
schedule the tasklet in mlx5_add_cq_to_tasklet() if the tasklet work
queue was empty before the new CQ was pushed to it.

The additional branch in mlx5_add_cq_to_tasklet(), called for each EQE,
may add a small cost for the userspace Infiniband CQs whose completions
are processed in tasklet context. But this seems worth it to avoid the
tasklet overhead for CQs that don't need it.

Note that the mlx4 driver works the same way: it schedules the tasklet
in mlx4_add_cq_to_tasklet() and only if the work queue was empty before.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Acked-by: Tariq Toukan <tariqt@nvidia.com>
Acked-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://patch.msgid.link/20241105204000.1807095-1-csander@purestorage.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2024-11-09 16:15:17 -08:00
..
accel accel/ivpu: Fix NOC firewall interrupt handling 2024-10-30 10:17:00 +01:00
accessibility treewide: remove unnecessary <linux/version.h> inclusion 2024-08-12 18:36:44 +09:00
acpi ACPI: CPPC: Make rmw_lock a raw_spin_lock 2024-10-29 12:56:19 +01:00
amba ARM: 9416/1: amba: make amba_bustype constant 2024-09-04 15:01:17 +01:00
android binder: modify the comment for binder_proc_unlock 2024-09-11 16:02:45 +02:00
ata ata: libata: Set DID_TIME_OUT for commands that actually timed out 2024-10-24 11:14:00 +02:00
atm atm: idt77252: prevent use after free in dequeue_rx() 2024-08-12 10:41:44 +01:00
auxdisplay move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
base Driver core revert fix for 6.12-rc6 2024-11-03 08:51:53 -10:00
bcma PCI: Rename CRS Completion Status to RRS 2024-09-10 19:52:30 -05:00
block block-6.12-20241018 2024-10-18 15:53:00 -07:00
bluetooth Bluetooth: btusb: Fix regression with fake CSR controllers 0a12:0001 2024-10-16 16:10:25 -04:00
bus Driver core update for 6.12-rc1 2024-09-27 08:48:37 -07:00
cache cache: StarFive: Require a 64-bit system 2024-08-01 07:15:02 -07:00
cdrom cdrom: Avoid barrier_nospec() in cdrom_ioctl_media_changed() 2024-10-17 19:47:15 -06:00
cdx cdx: remove unused struct 'cdx_mcdi_copy_buffer' 2024-07-31 13:56:50 +02:00
char tpm: Lock TPM chip in tpm_pm_suspend() first 2024-11-04 01:59:08 +02:00
clk Two clk driver fixes and a unit test fix: 2024-10-17 16:24:42 -07:00
clocksource Updates for x86 timers: 2024-09-17 15:27:01 +02:00
comedi move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
connector connector/cn_proc: revert "connector: Fix proc_event_num_listeners count not cleared" 2024-02-13 11:15:44 +01:00
counter move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
cpufreq cpufreq/amd-pstate: Use nominal perf for limits when boost is disabled 2024-10-15 23:54:15 -05:00
cpuidle pmdomain core: 2024-09-18 10:49:45 +02:00
crypto This push fixes the following issues: 2024-10-16 08:42:54 -07:00
cxl cxl/port: Prevent out-of-order decoder allocation 2024-10-25 16:07:03 -05:00
dax device-dax: correct pgoff align in dax_set_mapping() 2024-10-09 12:47:19 -07:00
dca Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
devfreq PM / devfreq: imx-bus: Use of_property_present() 2024-09-05 01:23:56 +09:00
dio dio: Have dio_bus_match() callback take a const * 2024-07-10 15:38:14 +02:00
dma dmaengine fixes for v6.12 2024-11-03 10:15:50 -10:00
dma-buf drm next for 6.12-rc1 2024-09-19 10:18:15 +02:00
dpll dpll: add clock quality level attribute and op 2024-11-03 08:39:07 -08:00
edac EDAC/qcom: Make irq configuration optional 2024-10-05 22:17:08 -05:00
eisa driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
extcon Char/Misc and other driver changes for 6.12-rc1 2024-09-26 10:13:08 -07:00
firewire firewire: core: fix invalid port index for parent device 2024-10-27 11:14:35 +09:00
firmware soc: fixes for 6.12, part 2 2024-11-04 15:23:26 -10:00
fpga move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
fsi move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
gnss [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
gpio gpiolib: fix debugfs dangling chip separator 2024-10-31 19:14:17 +01:00
gpu Driver Changes: 2024-11-02 04:44:27 +10:00
greybus move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
hid hid-for-linus-20241105 2024-11-06 07:49:54 -10:00
hsi HSI: omap-ssi: Remove unnecessary debugfs_create_dir() error check 2024-08-27 15:28:56 +02:00
hte hte: tegra-194: add missing MODULE_DESCRIPTION() macro 2024-06-19 12:24:03 -07:00
hv drm next for 6.12-rc1 2024-09-19 10:18:15 +02:00
hwmon [PATCH} hwmon: (jc42) Properly detect TSE2004-compliant devices again 2024-10-14 19:14:08 -07:00
hwspinlock hwspinlock: qcom: implement bust operation 2024-05-29 12:52:26 -07:00
hwtracing [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
i2c i2c-for-6.12-rc2 2024-10-05 10:31:04 -07:00
i3c i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition 2024-09-17 16:51:45 +02:00
idle intel_idle: fix ACPI _CST matching for newer Xeon platforms 2024-09-25 22:30:33 +02:00
iio iio: dac: Kconfig: Fix build error for ltc2664 2024-10-24 18:46:04 +01:00
infiniband RDMA/bnxt_re: synchronize the qp-handle table array 2024-10-21 13:28:15 -03:00
input Input updates for v6.12-rc5 2024-11-03 08:35:29 -10:00
interconnect Merge branch 'icc-sm8350' into icc-next 2024-08-26 01:36:44 +03:00
iommu iommu/vt-d: Fix incorrect pci_for_each_dma_alias() for non-PCI devices 2024-10-15 10:17:54 +02:00
ipack driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
irqchip irqchip/gic-v4: Correctly deal with set_affinity on lazily-mapped VPEs 2024-10-27 17:30:16 +01:00
isdn mISDN: Fix typos 2024-11-09 09:14:12 -08:00
leds move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
macintosh move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
mailbox mailbox, remoteproc: omap2+: fix compile testing 2024-09-27 09:11:05 -05:00
mcb Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
md - fix memory safety bugs in dm-cache 2024-11-06 07:56:47 -10:00
media move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
memory memory: pl353-smc: simplify with scoped for each OF child loop 2024-08-31 07:44:24 +02:00
memstick move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
message SCSI misc on 20240928 2024-09-29 09:22:34 -07:00
mfd move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
misc mei: use kvmalloc for read buffer 2024-10-29 04:01:40 +01:00
mmc mmc: sdhci-pci-gli: GL9767: Fix low power mode in the SD Express process 2024-10-28 12:30:27 +01:00
most Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
mtd move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
mux mux: remove usage of the deprecated ida_simple_xx() API 2024-04-29 08:20:07 -07:00
net mlx5/core: Schedule EQ comp tasklet only if necessary 2024-11-09 16:15:17 -08:00
nfc move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
ntb ntb: Force physically contiguous allocation of rx ring buffers 2024-09-20 10:51:25 -04:00
nubus nubus: Make nubus_bus_type static and constant 2024-01-03 13:33:59 +01:00
nvdimm virtio: features, fixes, cleanups 2024-09-26 08:43:17 -07:00
nvme block-6.12-20241101 2024-11-01 13:41:55 -10:00
nvmem Char/Misc and other driver changes for 6.12-rc1 2024-09-26 10:13:08 -07:00
of of: Skip kunit tests when arm64+ACPI doesn't populate root node 2024-10-10 12:43:01 -05:00
opp OPP: fix error code in dev_pm_opp_set_config() 2024-10-02 01:27:50 +02:00
parisc parisc: pdc_stable: Constify struct kobj_type 2024-09-09 08:53:17 +02:00
parport parport: Proper fix for array out-of-bounds access 2024-10-13 18:17:35 +02:00
pci pci-v6.12-fixes-2 2024-11-01 15:44:23 -10:00
pcmcia move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
peci move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
perf drivers/perf: riscv: Align errno for unsupported perf event 2024-10-01 02:47:39 -07:00
phy phy: tegra: xusb: Add error pointer check in xusb.c 2024-10-21 23:34:42 +05:30
pinctrl pinctrl: ocelot: fix system hang on level based interrupts 2024-10-12 22:04:38 +02:00
platform platform-drivers-x86 for v6.12-4 2024-11-06 08:03:19 -10:00
pmdomain pmdomain: qcom-cpr: Fix the return of uninitialized variable 2024-10-02 12:38:53 +02:00
pnp driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
power move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
powercap powercap: dtpm_devfreq: Fix error check against dev_pm_qos_add_request() 2024-10-21 13:23:06 +02:00
pps [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
ps3 driver/ps3: Include <video/cmdline.h> for mode parsing 2023-02-20 14:56:51 +01:00
ptp ptp: Remove 'default y' for VMCLOCK PTP device 2024-11-04 18:18:10 -08:00
pwm pwm: imx-tpm: Use correct MODULO value for EPWM mode 2024-10-25 11:29:17 +02:00
rapidio driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
ras RAS/AMD/ATL: Translate normalized to system physical addresses using PRM 2024-08-01 14:36:29 +02:00
regulator regulator: sm5703: Remove because it is unused and fails to build 2024-09-13 19:08:14 +01:00
remoteproc mhu-v3, omap2+ : fix kconfig dependencies 2024-09-29 09:53:04 -07:00
reset reset: starfive: jh71x0: Fix accessing the empty member on JH7110 SoC 2024-09-30 14:24:37 +02:00
rpmsg rpmsg: glink: Handle rejected intent request better 2024-10-24 13:03:37 -05:00
rtc move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
s390 s390/sclp_vt220: Convert newlines to CRLF instead of LFCR 2024-10-16 11:32:32 +02:00
sbus [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
scsi SCSI fixes on 20241030 2024-10-30 08:16:23 -10:00
sh sh: intc: Replace simple_strtoul() with kstrtoul() 2024-09-26 17:25:29 +02:00
siox Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
slimbus slimbus: qcom-ngd-ctrl: use 'time_left' variable with wait_for_completion_timeout() 2024-09-03 12:10:38 +02:00
soc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-11-07 13:44:16 -08:00
soundwire soundwire: intel_ace2x: Send PDI stream number during prepare 2024-10-17 12:11:19 +01:00
spi spi: spi-fsl-dspi: Fix crash when not using GPIO chip select 2024-10-23 22:37:54 +01:00
spmi spmi: pmic-arb: add missing newline in dev_err format strings 2024-07-31 13:49:28 +02:00
ssb driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
staging Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-11-07 13:44:16 -08:00
target SCSI fixes on 20241019 2024-10-19 12:52:19 -07:00
tc driver core: have match() callback in struct bus_type take a const * 2024-07-03 15:16:54 +02:00
tee optee: Fix a NULL vs IS_ERR() check 2024-09-09 12:22:06 +02:00
thermal Power management updates for 6.12-rc3 2024-10-11 11:41:20 -07:00
thunderbolt thunderbolt: Honor TMU requirements in the domain when setting TMU mode 2024-10-21 09:42:42 +03:00
tty serial: qcom-geni: rename suspend functions 2024-10-11 08:39:24 +02:00
ufs SCSI fixes on 20241030 2024-10-30 08:16:23 -10:00
uio uio: Constify struct kobj_type 2024-09-11 16:02:54 +02:00
usb usb: typec: tcpm: restrict SNK_WAIT_CAPABILITIES_TIMEOUT transitions to non self-powered devices 2024-10-29 04:38:00 +01:00
vdpa virtio: bugfixes 2024-10-07 11:33:26 -07:00
vfio [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
vhost virtio: bugfixes 2024-10-07 11:33:26 -07:00
video fbdev: wm8505fb: select CONFIG_FB_IOMEM_FOPS 2024-10-21 11:16:51 +02:00
virt [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
virtio virtio: bugfixes 2024-10-07 11:33:26 -07:00
w1 w1: ds2482: Drop explicit initialization of struct i2c_device_id::driver_data to 0 2024-09-06 19:18:32 +02:00
watchdog move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
xen xen: Remove dependency between pciback and privcmd 2024-10-18 11:59:04 +02:00
zorro Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
Kconfig - removed AR7 platform support 2023-11-10 09:19:46 -08:00
Makefile leds: Init leds class earlier 2024-09-04 17:24:58 -05:00