forked from 0ad/0ad
janwas
7862e79e84
trace: make note of IO size xmlutils: fix old remnant of Handle vfs_load return type. This was SVN commit r3456.
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
#ifndef VFS_OPTIMIZER_H__
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#define VFS_OPTIMIZER_H__
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extern void trace_enable(bool want_enabled);
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extern void trace_shutdown();
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extern void trace_notify_load(const char* P_fn, size_t size, uint flags);
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extern void trace_notify_free(const char* P_fn, size_t size);
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// TraceEntry operation type.
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// note: rather than only a list of accessed files, we also need to
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// know the application's behavior WRT caching (e.g. when it releases
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// cached buffers). this is necessary so that our simulation can
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// yield the same results.
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enum TraceOp
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{
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TO_LOAD,
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TO_FREE
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};
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// stores one event that is relevant for file IO / caching.
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//
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// size-optimized a bit since these are all kept in memory
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// (to prevent trace file writes from affecting other IOs)
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struct TraceEntry
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{
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// note: float instead of double for nice 16 byte struct size
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float timestamp; // returned by get_time before operation starts
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const char* atom_fn; // path+name of affected file
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// rationale: store size in the trace because other applications
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// that use this trace format but not our IO code wouldn't know
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// size (since they cannot retrieve the file info given atom_fn).
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size_t size; // of IO (usually the entire file)
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uint op : 8; // operation - see TraceOp
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uint flags : 24; // misc, e.g. file_io flags.
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};
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struct Trace
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{
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const TraceEntry* ents;
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size_t num_ents;
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};
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extern void trace_get(Trace* t);
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extern LibError trace_write_to_file(const char* trace_filename);
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extern LibError trace_read_from_file(const char* trace_filename, Trace* t);
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extern LibError build_optimized_archive(const char* trace_filename, const char* zip_filename);
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#endif // #ifndef VFS_OPTIMIZER_H__
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