Oleg Nesterov 7a166094bd uprobes: kill xol_area->slot_count ...

Add the new helper, xol_get_slot_nr() which does
find_first_zero_bit() + test_and_set_bit().

xol_take_insn_slot() can wait for the "xol_get_slot_nr() < UINSNS_PER_PAGE"
event instead of "area->slot_count < UINSNS_PER_PAGE".

So we can kill area->slot_count and avoid atomic_inc() + atomic_dec(), this
simplifies the code and can slightly improve the performance.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20241001142458.GA13629@redhat.com

2024-10-07 09:28:45 +02:00

..

callchain.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

core.c

[tree-wide] finally take no_llseek out

2024-09-27 08:18:43 -07:00

hw_breakpoint_test.c

perf/hw_breakpoint: remove MODULE_LICENSE in non-modules

2023-04-13 13:13:52 -07:00

hw_breakpoint.c

perf/hw_breakpoint: Remove arch breakpoint hooks

2023-08-16 23:54:50 +10:00

internal.h

perf/aux: Fix AUX buffer serialization

2024-09-04 18:22:56 +02:00

Makefile

perf/hw_breakpoint: Add KUnit test for constraints accounting

2022-08-30 10:56:20 +02:00

ring_buffer.c

perf/aux: Fix AUX buffer serialization

2024-09-04 18:22:56 +02:00

uprobes.c

uprobes: kill xol_area->slot_count

2024-10-07 09:28:45 +02:00