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cd047867ee
rb_add_augmented_cached() links the new node and then calls
->propagate() from the parent up to the root to bring the augmented
data of the ancestors up to date. It marks that as "suboptimal": every
augmented user that open-codes its insertion (interval trees, vmalloc,
drm_mm, gpu buddy, ...) instead folds the new node's value into each
ancestor while walking down, which touches no sibling and needs no
second pass. ->propagate() has to read both children of every
ancestor until it finds one whose value did not change.
Add a ->merge() callback to struct rb_augment_callbacks that folds the
augmented data of a node being inserted into one of its future
ancestors, and use it on the descent. RB_DECLARE_CALLBACKS() derives
it from the RB_AUG() list, so every user of the template gets it for
free, and sched/eevdf, the only caller of the helper, needs no change.
The new node's augmented data must describe the node alone before the
call. That was already required, since ->propagate() read it, and
sched/eevdf sets it up that way.
Measured with rbtree_test's cached augmented test switched to
rb_add_augmented_cached() (next patch), nnodes cached insert+delete,
median of 5 runs, for reference also the open-coded descent used by
augmented test 1. Raspberry Pi 4 Model B (Cortex-A72, 1.8 GHz), arch
timer ticks (54 MHz):
nnodes open-coded before after
100 459 500 442 (-11.6%)
10000 182046 186144 180208 (-3.2%)
100000 5533679 5711647
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| .. | ||
| ABI | ||
| accel | ||
| accounting | ||
| admin-guide | ||
| arch | ||
| block | ||
| bpf | ||
| cdrom | ||
| core-api | ||
| cpu-freq | ||
| crypto | ||
| dev-tools | ||
| devicetree | ||
| doc-guide | ||
| driver-api | ||
| edac | ||
| fault-injection | ||
| fb | ||
| features | ||
| filesystems | ||
| firmware_class | ||
| firmware-guide | ||
| fpga | ||
| gpu | ||
| hid | ||
| hwmon | ||
| i2c | ||
| iio | ||
| images | ||
| infiniband | ||
| input | ||
| kbuild | ||
| kernel-hacking | ||
| leds | ||
| litmus-tests | ||
| livepatch | ||
| locking | ||
| maintainer | ||
| mhi | ||
| misc-devices | ||
| mm | ||
| netlabel | ||
| netlink | ||
| networking | ||
| nvdimm | ||
| nvme | ||
| PCI | ||
| pcmcia | ||
| peci | ||
| power | ||
| process | ||
| RCU | ||
| rust | ||
| scheduler | ||
| scsi | ||
| security | ||
| sound | ||
| sphinx | ||
| sphinx-includes | ||
| sphinx-static | ||
| spi | ||
| staging | ||
| sunrpc/xdr | ||
| target | ||
| tee | ||
| timers | ||
| tools | ||
| trace | ||
| translations | ||
| usb | ||
| userspace-api | ||
| virt | ||
| w1 | ||
| watchdog | ||
| wmi | ||
| .gitignore | ||
| .renames.txt | ||
| atomic_bitops.txt | ||
| atomic_t.txt | ||
| Changes | ||
| CodingStyle | ||
| conf.py | ||
| docutils.conf | ||
| index.rst | ||
| Kconfig | ||
| Makefile | ||
| memory-barriers.txt | ||
| SubmittingPatches | ||
| subsystem-apis.rst | ||