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|dc1ab04e||mjg||July 5, 2021, 8:42 a.m.||pf: allow table stats clearing and reading with ruleset rlock
Instead serialize against these operations with a dedicated lock. Prior to the change, When pushing 17 mln pps of traffic, calling DIOCRGETTSTATS in a loop would restrict throughput to about 7 mln. With the change there is no slowdown. Reviewed by: kp (previous version) Sponsored by: Rubicon Communications, LLC ("Netgate")cgit
|f92c21a2||mjg||July 5, 2021, 8:42 a.m.||pf: depessimize table handling
Creating tables and zeroing their counters induces excessive IPIs (14 per table), which in turns kills single- and multi-threaded performance. Work around the problem by extending per-CPU counters with a general counter populated on "zeroing" requests -- it stores the currently found sum. Then requests to report the current value are the sum of per-CPU counters subtracted by the saved value. Sample timings when loading a config with 100k tables on a 104-way box: stock: pfctl -f tables100000.conf 0.39s user 69.37s system 99% cpu 1:09.76 total pfctl -f tables100000.conf 0.40s user 68.14s system 99% cpu 1:08.54 total patched: pfctl -f tables100000.conf 0.35s user 6.41s system 99% cpu 6.771 total pfctl -f tables100000.conf 0.48s user 6.47s system 99% cpu 6.949 total Reviewed by: kp (previous version) Sponsored by: Rubicon Communications, LLC ("Netgate")cgit
|c5d6dd80||pho||July 5, 2021, 7:16 a.m.||stress2: Wait for the "swap" program to terminate|
|7ebe83dd||pho||July 5, 2021, 7:14 a.m.||stress2: Limit scope of rm(1) wildcard in cleanup.
Reviewed by: rgrimescgit
|16789751||lwhsu||July 5, 2021, 2:14 a.m.||freebsd-tips: Fix the description of fetch(1) to match the command
Reported by: jrtc27 MFC with: ffe6afc4f0121f1909f2fa88694228f771dd3fcbcgit
|5fa1eb1c||wulf||July 5, 2021, 12:22 a.m.||Bump __FreeBSD_version to 1400025 for LinuxKPI change.|
|8b33cb83||wulf||July 5, 2021, 12:20 a.m.||LinuxKPI: Implement sequence counters and sequential locks|
|019391bf||wulf||July 5, 2021, 12:20 a.m.||LinuxKPI: Implement strscpy
strscpy copies the src string, or as much of it as fits, into the dst buffer. The dst buffer is always NUL terminated, unless it's zero-sized. strscpy returns the number of characters copied (not including the trailing NUL) or -E2BIG if len is 0 or src was truncated. Currently drm-kmod replaces strscpy with strncpy that is not quite correct as strncpy does not NUL-terminate truncated strings and returns different values on exit. Reviewed by: hselasky, imp, manu MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D31005cgit
|98a6984a||wulf||July 5, 2021, 12:20 a.m.||LinuxKPI: Use macro for implementation of some dma_map_* functions
This allows to remove unimplemented attrs parameter which type differs between Linux kernel versions and to compile both drm-kmod and ofed callers unmodified. Also convert it to 'unsigned long' type to match modern Linuxes. Reviewed by: hselasky Differential revision: https://reviews.freebsd.org/D30932cgit
|864b1100||wulf||July 5, 2021, 12:20 a.m.||LinuxKPI: Implement irq_work_sync() routine.|
|1ab61a19||wulf||July 5, 2021, 12:19 a.m.||LinuxKPI: Do not wait for a grace period in rcu_barrier()
Linux docs explicitly state that this is not required : "Important note: The rcu_barrier() function is not, repeat, not, obligated to wait for a grace period. It is instead only required to wait for RCU callbacks that have already been posted. Therefore, if there are no RCU callbacks posted anywhere in the system, rcu_barrier() is within its rights to return immediately. Even if there are callbacks posted, rcu_barrier() does not necessarily need to wait for a grace period."  https://www.kernel.org/doc/Documentation/RCU/Design/Requirements/Requirements.html Reviewed by: emaste, hselasky, manu MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D30809cgit
|c0862b2b||wulf||July 5, 2021, 12:19 a.m.||LinuxKPI: Add compiler barriers to list_for_each_entry_lockless macro
so this list-traversal primitive may safely run concurrently with the _rcu list-mutation primitives such as list_add_rcu() as long as the traversal is guarded by rcu_read_lock(). Do it by reusing the "list_for_each_entry_rcu" macro which does the same. On Linux it implements some additional lockdep stuff which we skip. Also move the macro to linux/rculist.h where it resides on Linux. Reviewed by: hselasky Differential revision: https://reviews.freebsd.org/D30795cgit
|c77ec79b||wulf||July 5, 2021, 12:19 a.m.||LinuxKPI: Change flags parameter type of atomic_dec_and_lock_irqsave
On Linux atomic_dec_and_lock_irqsave is a wrapper macro which provides a reference to third parameter rather than parameter value itself to implementation routine called _atomic_dec_and_lock_irqsave . While here, implement a fast path.  https://github.com/torvalds/linux/blob/master/include/linux/spinlock.h#L476 Reviewed by: hselasky Differential revision: https://reviews.freebsd.org/D30781cgit
|78a02d8b||wulf||July 5, 2021, 12:18 a.m.||LinuxKPI: Add #defines required by drm-kmod v5.5|
|a2b83b59||wulf||July 5, 2021, 12:18 a.m.||LinuxKPI: Allow kmem_cache_free() to be called from critical sections
as it is required by i915kms driver from Linux kernel v 5.5. This is done with asynchronous freeing of requested memory areas from taskqueue thread. As memory to be freed is reused to store linked list entry, backing UMA zone item size is rounded up to pointer size. While here, make struct linux_kmem_cache private to LKPI to reduce amount of BSD headers included by linux/slab.h and switch RCU code to usage of LKPI's linux_irq_work_tq taskqueue to avoid injection of current into system-wide taskqueue_fast thread context. Submitted by: nc (initial version for drm-kmod) Reviewed by: manu, nc Differential revision: https://reviews.freebsd.org/D30760cgit