vasilito
dc68054305
- Restore 29 recipe symlinks (libdrm, qtbase, dbus, sddm, pipewire, etc.) - Restore 33 patches (KDE, libdrm, mesa, pipewire, sddm, wireplumber) - Restore 20+ local/scripts (audit, lint, test, build helpers) - Restore src/cook/scheduler.rs, status.rs, gnu-config/ - Restore scripts/patch-inclusion-gate.sh, run_mini1.sh, validate-collision-log.sh - Recover TLC source from HEAD (was overwritten by 0.2.3 checkout) - Recover 11 local/docs plans from HEAD (were overwritten) - Recover qt6-wayland-smoke symlink from HEAD - Fix MOTD: remove garbled ASCII art, use clean text - Update version: 0.2.0 -> 0.2.4 in os-release, motd, config - Reduce filesystem_size: 1536 -> 512 MiB - Add ABSOLUTE RULE to AGENTS.md: never delete/ignore packages - Reduce pcid scheme log verbosity: info -> debug
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_AVERAGE_H
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#define _LINUX_AVERAGE_H
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#include <linux/bug.h>
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#include <linux/compiler.h>
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#include <linux/log2.h>
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/*
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* Exponentially weighted moving average (EWMA)
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*
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* This implements a fixed-precision EWMA algorithm, with both the
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* precision and fall-off coefficient determined at compile-time
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* and built into the generated helper funtions.
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*
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* The first argument to the macro is the name that will be used
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* for the struct and helper functions.
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*
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* The second argument, the precision, expresses how many bits are
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* used for the fractional part of the fixed-precision values.
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*
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* The third argument, the weight reciprocal, determines how the
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* new values will be weighed vs. the old state, new values will
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* get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
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* that this parameter must be a power of two for efficiency.
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*/
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#define DECLARE_EWMA(name, _precision, _weight_rcp) \
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struct ewma_##name { \
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unsigned long internal; \
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}; \
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static inline void ewma_##name##_init(struct ewma_##name *e) \
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{ \
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BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
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BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
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/* \
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* Even if you want to feed it just 0/1 you should have \
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* some bits for the non-fractional part... \
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*/ \
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BUILD_BUG_ON((_precision) > 30); \
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BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
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e->internal = 0; \
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} \
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static inline unsigned long \
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ewma_##name##_read(struct ewma_##name *e) \
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{ \
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BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
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BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
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BUILD_BUG_ON((_precision) > 30); \
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BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
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return e->internal >> (_precision); \
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} \
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static inline void ewma_##name##_add(struct ewma_##name *e, \
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unsigned long val) \
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{ \
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unsigned long internal = READ_ONCE(e->internal); \
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unsigned long weight_rcp = ilog2(_weight_rcp); \
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unsigned long precision = _precision; \
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\
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BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
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BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
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BUILD_BUG_ON((_precision) > 30); \
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BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
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\
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WRITE_ONCE(e->internal, internal ? \
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(((internal << weight_rcp) - internal) + \
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(val << precision)) >> weight_rcp : \
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(val << precision)); \
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}
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#endif /* _LINUX_AVERAGE_H */
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