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capture: add simple mark support

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The goal here is to have an API that allows us to record things like
frame timing data. We might iterate on this API a bit, but this gets us
started.

A SpCaptureMark with a zero duration should be treated like an epoch mark
once a visualizer is created. SpCaptureMark with a non-zero duration should
be treated like a begin/end of operation. This may be useful in generating
something like a flame graph.
This commit is contained in:
Christian Hergert
2018-05-14 17:15:57 +01:00
parent e6d5d2b70d
commit 4bdbf130b2
8 changed files with 173 additions and 0 deletions
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52
lib/capture/sp-capture-reader.c
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@ -198,6 +198,17 @@ sp_capture_reader_bswap_map (SpCaptureReader *self,
}
}
static inline void
sp_capture_reader_bswap_mark (SpCaptureReader *self,
SpCaptureMark *mark)
{
g_assert (self != NULL);
g_assert (mark != NULL);
if (G_UNLIKELY (self->endian != G_BYTE_ORDER))
mark->duration = GUINT64_SWAP_LE_BE (mark->duration);
}
static inline void
sp_capture_reader_bswap_jitmap (SpCaptureReader *self,
SpCaptureJitmap *jitmap)
@ -426,6 +437,47 @@ sp_capture_reader_read_map (SpCaptureReader *self)
return map;
}
const SpCaptureMark *
sp_capture_reader_read_mark (SpCaptureReader *self)
{
SpCaptureMark *mark;
g_assert (self != NULL);
g_assert ((self->pos % SP_CAPTURE_ALIGN) == 0);
g_assert (self->pos <= self->bufsz);
if (!sp_capture_reader_ensure_space_for (self, sizeof *mark))
return NULL;
mark = (SpCaptureMark *)(gpointer)&self->buf[self->pos];
sp_capture_reader_bswap_frame (self, &mark->frame);
if (mark->frame.type != SP_CAPTURE_FRAME_MARK)
return NULL;
if (mark->frame.len < (sizeof *mark + 1))
return NULL;
if (!sp_capture_reader_ensure_space_for (self, mark->frame.len))
return NULL;
mark = (SpCaptureMark *)(gpointer)&self->buf[self->pos];
sp_capture_reader_bswap_mark (self, mark);
self->pos += mark->frame.len;
if ((self->pos % SP_CAPTURE_ALIGN) != 0)
return NULL;
/* Ensure trailing \0 in name and message */
mark->name[sizeof mark->name - 1] = 0;
self->buf[self->pos + mark->frame.len - 1] = 0;
return mark;
}
const SpCaptureProcess *
sp_capture_reader_read_process (SpCaptureReader *self)
{