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[host] dxgi: sleep until it's close to time to map

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This change adds an average function to time how long it takes the GPU
to copy and map the texture, and then uses this average to sleep for 80%
of this average lowering CPU usage and potentially decreasing lock
contention.
This commit is contained in:
Geoffrey McRae
2021-06-06 09:35:50 +10:00
committed by Geoffrey McRae
parent 7f5f46c448
commit f02d61d665
4 changed files with 118 additions and 0 deletions
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1
common/CMakeLists.txt
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@@ -28,6 +28,7 @@ set(COMMON_SOURCES
src/framebuffer.c
src/KVMFR.c
src/countedbuffer.c
src/runningavg.c
)
add_library(lg_common STATIC ${COMMON_SOURCES})

28
common/include/common/runningavg.h Normal file
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@@ -0,0 +1,28 @@
/*
Looking Glass
Copyright (C) 2017-2021 The Looking Glass Authors
https://looking-glass.io
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdint.h>
typedef struct RunningAvg * RunningAvg;
RunningAvg runningavg_new(int length);
void runningavg_free(RunningAvg * ra);
void runningavg_push(RunningAvg ra, int64_t value);
void runningavg_reset(RunningAvg ra);
double runningavg_calc(RunningAvg ra);

69
common/src/runningavg.c Normal file
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@@ -0,0 +1,69 @@
/*
Looking Glass
Copyright (C) 2017-2021 The Looking Glass Authors
https://looking-glass.io
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "common/runningavg.h"
#include <stdlib.h>
struct RunningAvg
{
int length, samples;
int pos;
int value;
int64_t values[0];
};
RunningAvg runningavg_new(int length)
{
struct RunningAvg * ra = calloc(1, sizeof(*ra) + sizeof(*ra->values) * length);
ra->length = length;
return ra;
}
void runningavg_free(RunningAvg * ra)
{
free(*ra);
*ra = NULL;
}
void runningavg_push(RunningAvg ra, int64_t value)
{
if (ra->samples == ra->length)
ra->value -= ra->values[ra->pos];
else
++ra->samples;
ra->value += value;
ra->values[ra->pos++] = value;
if (ra->pos == ra->length)
ra->pos = 0;
}
void runningavg_reset(RunningAvg ra)
{
ra->samples = 0;
ra->pos = 0;
ra->value = 0;
}
double runningavg_calc(RunningAvg ra)
{
return (double)ra->value / ra->samples;
}