Provide some default values for the ThinLTO Cache pruning

This control how the cache is pruned. The cache still has to be explicitely enabled/disabled by providing a path. From: Mehdi Amini <[email protected]> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268393 91177308-0d34-0410-b5e6-96231b3b80d8
CAHollenbeck · May 3, 2016 · f4c5ea4 · f4c5ea4
1 parent d80450e
commit f4c5ea4
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Showing 2 changed files with 10 additions and 7 deletions.
diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h
@@ -659,6 +659,7 @@ extern lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
 
 /**
  * Sets the path to a directory to use as a cache storage for incremental build.
+ * Setting this activates caching.
  *
  * \since LTO_API_VERSION=18
  */
@@ -667,7 +668,7 @@ extern void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
 
 /**
  * Sets the cache pruning interval (in seconds). A negative value disable the
- * pruning (default).
+ * pruning. An unspecified default value will be applied.
  *
  * \since LTO_API_VERSION=18
  */
@@ -678,7 +679,8 @@ extern void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
  * Sets the maximum cache size that can be persistent across build, in terms of
  * percentage of the available space on the the disk. Set to 100 to indicate
  * no limit, 50 to indicate that the cache size will not be left over half the
- * available space. A value over 100 will be reduced to 100.
+ * available space. A value over 100 will be reduced to 100. An unspecified 
+ * default value will be applied.
  *
  * The formula looks like:
  *  AvailableSpace = FreeSpace + ExistingCacheSize
@@ -690,7 +692,8 @@ extern void thinlto_codegen_set_final_cache_size_relative_to_available_space(
     thinlto_code_gen_t cg, unsigned percentage);
 
 /**
- * Sets the expiration (in seconds) for an entry in the cache.
+ * Sets the expiration (in seconds) for an entry in the cache. An unspecified
+ * default value will be applied.
  *
  * \since LTO_API_VERSION=18
  */

diff --git a/include/llvm/LTO/ThinLTOCodeGenerator.h b/include/llvm/LTO/ThinLTOCodeGenerator.h
@@ -108,10 +108,10 @@ class ThinLTOCodeGenerator {
    */
 
   struct CachingOptions {
-    std::string Path;
-    int PruningInterval = -1;               // seconds, -1 to disable pruning
-    unsigned int Expiration = 0;            // seconds.
-    unsigned MaxPercentageOfAvailableSpace = 0; // percentage.
+    std::string Path;                    // Path to the cache, empty to disable.
+    int PruningInterval = 1200;          // seconds, -1 to disable pruning.
+    unsigned int Expiration = 7 * 24 * 3600;     // seconds (1w default).
+    unsigned MaxPercentageOfAvailableSpace = 75; // percentage.
   };
 
   /// Provide a path to a directory where to store the cached files for