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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:24:58 +0000 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-06-30 12:27:06 +0000 |
| commit | 33606b41d35115f887ea688b1a16f2ff85bf2fe4 (patch) | |
| tree | 406b2c7b19a087ba437c68f3dbf0b589fa1d6150 /results/scraper/launchpad-without-comments/1618122 | |
| parent | adedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff) | |
| download | emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz emulator-bug-study-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip | |
add launchpad bug reports without comments
Diffstat (limited to 'results/scraper/launchpad-without-comments/1618122')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1618122 | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1618122 b/results/scraper/launchpad-without-comments/1618122 new file mode 100644 index 00000000..5a660f3f --- /dev/null +++ b/results/scraper/launchpad-without-comments/1618122 @@ -0,0 +1,45 @@ +qemu-monitor screendump very slow + +qemu-monitor screendump often using 10-20% cpu usage of one core to take a small capture. + +Most of the CPU usage seems to come from libpixman. There were many reports of libpixman becoming 8 times slower in newer releases. + +https://github.com/qemu/qemu/blob/0c56c6ab68902281094c7aac6305e2321c34c187/ui/console.c#L285 + + +Simple Valgrind Ir report. + +-------------------------------------------------------------------------------- + Ir +-------------------------------------------------------------------------------- +56,592,286,124 PROGRAM TOTALS + +-------------------------------------------------------------------------------- + Ir file:function +-------------------------------------------------------------------------------- +40,288,379,712 ???:0x000000000000caa0 [/usr/lib64/libpixman-1.so.0.34.0] + 3,585,795,168 ???:0x000000000006df20 [/usr/lib64/libpixman-1.so.0.34.0] + 1,763,982,432 ???:0x0000000000052360 [/usr/lib64/libpixman-1.so.0.34.0] + 1,517,832,033 ???:__memcpy_sse2_unaligned [/usr/lib64/libc-2.23.so] + 993,997,885 ???:__GI_mempcpy [/usr/lib64/libc-2.23.so] + 484,059,456 ???:0x0000000000050430 [/usr/lib64/libpixman-1.so.0.34.0] + 460,109,168 ???:pixman_image_composite32 [/usr/lib64/libpixman-1.so.0.34.0] + +I tried taking a look on how to fix this, but it seems pixmap is deeply enrooted inside the monitor. I wanted to try to simply take whats on the display and memcpy it into .ppm format manually creating the file header, but I cant figure out where the raw display buffer/image starts. + +For example this is DisplaySurface: + +struct DisplaySurface { + pixman_format_code_t format; + pixman_image_t *image; + uint8_t flags; +#ifdef CONFIG_OPENGL + GLenum glformat; + GLenum gltype; + GLuint texture; +#endif +}; + +Which as you can see already has the pixman_image_t. Maybe I should just work with that pixman_image_t? + +The most effective solution IMO seems to just memcpy from the display into a premade header for a .ppm or .bmp file assuming 24 or 32 bpp. No need for libpixman. \ No newline at end of file |