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[trace] Keep track of a uint64_t tracing context

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The most common information that you want to track between begin() and
end() is the timestamp of the begin function, so you can measure the
duration of the (de)compression call. Allow the tracing library to put
this information inside the `ZSTD_TraceCtx`, so it doesn't need to keep
a global map in this case. If a single uint64_t is not enough, the
tracing library can return a unique identifier (like the context
pointer) instead, and use it as a key in a map.

This keeps the simple case simple.
This commit is contained in:
Nick Terrell
2021-02-09 11:37:05 -08:00
parent 856f38e6c5
commit e59c9459a5
8 changed files with 95 additions and 72 deletions
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lib/decompress/zstd_decompress.c
+5 -4
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@@ -789,8 +789,8 @@ static size_t ZSTD_setRleBlock(void* dst, size_t dstCapacity,
static void ZSTD_DCtx_trace_end(ZSTD_DCtx const* dctx, U64 uncompressedSize, U64 compressedSize, unsigned streaming)
{
#if ZSTD_TRACE
if (dctx->tracingEnabled) {
ZSTD_trace trace;
if (dctx->traceCtx) {
ZSTD_Trace trace;
ZSTD_memset(&trace, 0, sizeof(trace));
trace.version = ZSTD_VERSION_NUMBER;
trace.streaming = streaming;
@@ -801,7 +801,8 @@ static void ZSTD_DCtx_trace_end(ZSTD_DCtx const* dctx, U64 uncompressedSize, U64
}
trace.uncompressedSize = (size_t)uncompressedSize;
trace.compressedSize = (size_t)compressedSize;
ZSTD_trace_decompress_end(dctx, &trace);
trace.dctx = dctx;
ZSTD_trace_decompress_end(dctx->traceCtx, &trace);
}
#else
(void)dctx;
@@ -1383,7 +1384,7 @@ size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx)
{
assert(dctx != NULL);
#if ZSTD_TRACE
dctx->tracingEnabled = ZSTD_trace_decompress_begin(dctx);
dctx->traceCtx = ZSTD_trace_decompress_begin(dctx);
#endif
dctx->expected = ZSTD_startingInputLength(dctx->format); /* dctx->format must be properly set */
dctx->stage = ZSTDds_getFrameHeaderSize;