From: Christian Gmeiner <christian.gmeiner@gmail.com> To: linux-kernel@vger.kernel.org Cc: Christian Gmeiner <christian.gmeiner@gmail.com>, Lucas Stach <l.stach@pengutronix.de>, Russell King <linux+etnaviv@armlinux.org.uk>, David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>, etnaviv@lists.freedesktop.org (moderated list:DRM DRIVERS FOR VIVANTE GPU IP), dri-devel@lists.freedesktop.org (open list:DRM DRIVERS FOR VIVANTE GPU IP) Subject: [PATCH v2 1/4] drm/etnaviv: add simple moving average (SMA) Date: Tue, 21 Jun 2022 09:20:47 +0200 [thread overview] Message-ID: <20220621072050.76229-2-christian.gmeiner@gmail.com> (raw) In-Reply-To: <20220621072050.76229-1-christian.gmeiner@gmail.com> This adds a SMA algorithm inspired by Exponentially weighted moving average (EWMA) algorithm found in the kernel. Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com> --- drivers/gpu/drm/etnaviv/etnaviv_sma.h | 53 +++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_sma.h diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sma.h b/drivers/gpu/drm/etnaviv/etnaviv_sma.h new file mode 100644 index 000000000000..81564d5cbdc3 --- /dev/null +++ b/drivers/gpu/drm/etnaviv/etnaviv_sma.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020 Etnaviv Project + */ + +#ifndef __ETNAVIV_SMA_H__ +#define __ETNAVIV_SMA_H__ + +#include <linux/bug.h> +#include <linux/compiler.h> + +/* + * Simple moving average (SMA) + * + * This implements a fixed-size SMA algorithm. + * + * The first argument to the macro is the name that will be used + * for the struct and helper functions. + * + * The second argument, the samples, expresses how many samples are + * used for the SMA algorithm. + */ + +#define DECLARE_SMA(name, _samples) \ + struct sma_##name { \ + unsigned long pos; \ + unsigned long sum; \ + unsigned long samples[_samples]; \ + }; \ + static inline void sma_##name##_init(struct sma_##name *s) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_samples)); \ + memset(s, 0, sizeof(struct sma_##name)); \ + } \ + static inline unsigned long sma_##name##_read(struct sma_##name *s) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_samples)); \ + return s->sum / _samples; \ + } \ + static inline void sma_##name##_add(struct sma_##name *s, unsigned long val) \ + { \ + unsigned long pos = READ_ONCE(s->pos); \ + unsigned long sum = READ_ONCE(s->sum); \ + unsigned long sample = READ_ONCE(s->samples[pos]); \ + \ + BUILD_BUG_ON(!__builtin_constant_p(_samples)); \ + \ + WRITE_ONCE(s->sum, sum - sample + val); \ + WRITE_ONCE(s->samples[pos], val); \ + WRITE_ONCE(s->pos, pos + 1 == _samples ? 0 : pos + 1); \ + } + +#endif /* __ETNAVIV_SMA_H__ */ -- 2.36.1
WARNING: multiple messages have this Message-ID (diff)
From: Christian Gmeiner <christian.gmeiner@gmail.com> To: linux-kernel@vger.kernel.org Cc: David Airlie <airlied@linux.ie>, "moderated list:DRM DRIVERS FOR VIVANTE GPU IP" <etnaviv@lists.freedesktop.org>, "open list:DRM DRIVERS FOR VIVANTE GPU IP" <dri-devel@lists.freedesktop.org>, Russell King <linux+etnaviv@armlinux.org.uk> Subject: [PATCH v2 1/4] drm/etnaviv: add simple moving average (SMA) Date: Tue, 21 Jun 2022 09:20:47 +0200 [thread overview] Message-ID: <20220621072050.76229-2-christian.gmeiner@gmail.com> (raw) In-Reply-To: <20220621072050.76229-1-christian.gmeiner@gmail.com> This adds a SMA algorithm inspired by Exponentially weighted moving average (EWMA) algorithm found in the kernel. Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com> --- drivers/gpu/drm/etnaviv/etnaviv_sma.h | 53 +++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_sma.h diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sma.h b/drivers/gpu/drm/etnaviv/etnaviv_sma.h new file mode 100644 index 000000000000..81564d5cbdc3 --- /dev/null +++ b/drivers/gpu/drm/etnaviv/etnaviv_sma.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020 Etnaviv Project + */ + +#ifndef __ETNAVIV_SMA_H__ +#define __ETNAVIV_SMA_H__ + +#include <linux/bug.h> +#include <linux/compiler.h> + +/* + * Simple moving average (SMA) + * + * This implements a fixed-size SMA algorithm. + * + * The first argument to the macro is the name that will be used + * for the struct and helper functions. + * + * The second argument, the samples, expresses how many samples are + * used for the SMA algorithm. + */ + +#define DECLARE_SMA(name, _samples) \ + struct sma_##name { \ + unsigned long pos; \ + unsigned long sum; \ + unsigned long samples[_samples]; \ + }; \ + static inline void sma_##name##_init(struct sma_##name *s) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_samples)); \ + memset(s, 0, sizeof(struct sma_##name)); \ + } \ + static inline unsigned long sma_##name##_read(struct sma_##name *s) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_samples)); \ + return s->sum / _samples; \ + } \ + static inline void sma_##name##_add(struct sma_##name *s, unsigned long val) \ + { \ + unsigned long pos = READ_ONCE(s->pos); \ + unsigned long sum = READ_ONCE(s->sum); \ + unsigned long sample = READ_ONCE(s->samples[pos]); \ + \ + BUILD_BUG_ON(!__builtin_constant_p(_samples)); \ + \ + WRITE_ONCE(s->sum, sum - sample + val); \ + WRITE_ONCE(s->samples[pos], val); \ + WRITE_ONCE(s->pos, pos + 1 == _samples ? 0 : pos + 1); \ + } + +#endif /* __ETNAVIV_SMA_H__ */ -- 2.36.1
next prev parent reply other threads:[~2022-06-21 7:21 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-06-21 7:20 [PATCH v2 0/4] Add support for GPU load values Christian Gmeiner 2022-06-21 7:20 ` Christian Gmeiner 2022-06-21 7:20 ` Christian Gmeiner [this message] 2022-06-21 7:20 ` [PATCH v2 1/4] drm/etnaviv: add simple moving average (SMA) Christian Gmeiner 2022-06-24 9:22 ` Lucas Stach 2022-06-24 9:22 ` Lucas Stach 2022-07-02 11:41 ` Christian Gmeiner 2022-07-02 11:41 ` Christian Gmeiner 2022-06-21 7:20 ` [PATCH v2 2/4] drm/etnaviv: add loadavg accounting Christian Gmeiner 2022-06-21 7:20 ` Christian Gmeiner 2022-06-24 9:38 ` Lucas Stach 2022-06-24 9:38 ` Lucas Stach 2022-07-02 11:53 ` Christian Gmeiner 2022-07-02 11:53 ` Christian Gmeiner 2022-06-21 7:20 ` [PATCH v2 3/4] drm/etnaviv: show loadavg in debugfs Christian Gmeiner 2022-06-21 7:20 ` Christian Gmeiner 2022-06-21 7:20 ` [PATCH v2 4/4] drm/etnaviv: export loadavg via perfmon Christian Gmeiner 2022-06-21 7:20 ` Christian Gmeiner 2022-06-24 9:44 ` Lucas Stach 2022-06-24 9:44 ` Lucas Stach 2022-07-02 11:57 ` Christian Gmeiner 2022-07-02 11:57 ` Christian Gmeiner
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