SimpleCache: read small files all at once.

net/disk_cache/simple/simple_experiment.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_EXPERIMENT_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_EXPERIMENT_H_
 
 #include <stdint.h>
 
 #include "base/feature_list.h"
@@ skipping 13 matching lines @@
 };
 
 struct NET_EXPORT_PRIVATE SimpleExperiment {
   SimpleExperimentType type = SimpleExperimentType::NONE;
   uint32_t param = 0;
 };
 
 NET_EXPORT_PRIVATE SimpleExperiment
 GetSimpleExperiment(net::CacheType cache_type);
 
+NET_EXPORT_PRIVATE extern const base::Feature kSimpleCachePrefetchExperiment;
+NET_EXPORT_PRIVATE extern const char kSimplePrefetchBytesParam[];
+
+// Returns how large a file would get prefetched on reading the entry.
+// If the experiment is disabled, returns 0.
+NET_EXPORT_PRIVATE int GetSimpleCachePrefetchSize();

[pasko, 2017/07/18 14:02:57]

I think this file is for experiments that depend on persistent state on disk
(hence some index manipulations). The prefetch experiment does not need any of
this, hence it can be kept local to the sync entry. Not sure we can remove the
NET_EXPORT_PRIVATE if we want to test it, but the explicit separation would be
good.

[Maks Orlovich, 2017/07/25 16:06:29]

OK, done. This PoV is more convincing with the eviction experiment here..

+
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_EXPERIMENT_H_