3 files changed, 71 insertions, 6 deletions

diff --git a/ChangeLog.txt b/ChangeLog.txt
index e69de29..da78f78 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -0,0 +1,7 @@
+2008-09-16  Nicholaz Beresford  <nicholaz@blueflash.cc>
+
+        * linden/indra/newview/lltexturecache.cpp:
+        VWR-3878: Purging cache textures causes viewer to pause for many
+        seconds, with heavy disk activity.
+        * linden/indra/newview/lltexturecache.h:
+        Ditto.
diff --git a/linden/indra/newview/lltexturecache.cpp b/linden/indra/newview/lltexturecache.cpp
index 22cb6c1..0fbb3d9 100644
--- a/linden/indra/newview/lltexturecache.cpp
+++ b/linden/indra/newview/lltexturecache.cpp
@@ -881,6 +881,8 @@ LLTextureCache::LLTextureCache(bool threaded)
 
 LLTextureCache::~LLTextureCache()
 {
+        purgeTextureFilesTimeSliced(TRUE); // force-flush all pending file deletes
+
         apr_pool_destroy(mFileAPRPool);
 }
 
@@ -1187,7 +1189,7 @@ void LLTextureCache::purgeTextures(bool validate)
                 return;
         }
         
-        LL_DEBUGS("TextureCache") << "TEXTURE CACHE: Reading Entries..." << LL_ENDL;
+        LL_DEBUGS("TextureCache") << "TEXTURE CACHE: Reading " << num_entries << " Entries from " << mTexturesDirEntriesFileName << LL_ENDL;
         
         std::map<LLUUID, S32> entry_idx_map;
         S64 total_size = 0;
@@ -1216,7 +1218,7 @@ void LLTextureCache::purgeTextures(bool validate)
                 LL_DEBUGS("TextureCache") << "TEXTURE CACHE: Validating: " << validate_idx << LL_ENDL;
         }
         
-        S64 min_cache_size = (sCacheMaxTexturesSize * 9) / 10;
+        S64 min_cache_size = sCacheMaxTexturesSize / 100 * 95;
         S32 purge_count = 0;
         S32 next_idx = 0;
         for (S32 idx=0; idx<num_entries; idx++)
@@ -1250,8 +1252,8 @@ void LLTextureCache::purgeTextures(bool validate)
                 if (purge_entry)
                 {
                         purge_count++;
-                        LL_DEBUGS("TextureCache") << "PURGING: " << filename << LL_ENDL;
-                        ll_apr_file_remove(filename, NULL);
+                        LL_DEBUGS("TextureCache") << "PURGING: " << filename << LL_ENDL;
+                        mFilesToDelete.push_back(filename);
                         total_size -= entries[idx].mSize;
                         entries[idx].mSize = 0;
                 }
@@ -1266,7 +1268,11 @@ void LLTextureCache::purgeTextures(bool validate)
         }
         num_entries = next_idx;
 
-        LL_DEBUGS("TextureCache") << "TEXTURE CACHE: Writing Entries: " << num_entries << LL_ENDL;
+        mTimeLastFileDelete.reset();
+
+        LL_DEBUGS("TextureCache") << "TEXTURE CACHE: Writing Entries: " 
+                << num_entries << " (" << num_entries*sizeof(Entry)/1024 << "KB)"
+                << LL_ENDL;
         
         ll_apr_file_remove(mTexturesDirEntriesFileName, NULL);
         ll_apr_file_write_ex(mTexturesDirEntriesFileName, NULL,
@@ -1289,10 +1295,53 @@ void LLTextureCache::purgeTextures(bool validate)
         LL_INFOS("TextureCache") << "TEXTURE CACHE:"
                         << " PURGED: " << purge_count
                         << " ENTRIES: " << num_entries
-                        << " CACHE SIZE: " << total_size / 1024*1024 << " MB"
+                        << " CACHE SIZE: " << total_size/1024/1024 << " MB"
                         << llendl;
 }
 
+
+void LLTextureCache::purgeTextureFilesTimeSliced(BOOL force_all)
+{
+        LLMutexLock lock(&mHeaderMutex);
+
+        F32 delay_between_passes = 1.0f; // seconds
+        F32 max_time_per_pass = 0.1f; // seconds
+
+        if (!force_all && mTimeLastFileDelete.getElapsedTimeF32() <= delay_between_passes) 
+        {
+                return;
+        }
+
+        LLTimer timer;
+        S32 howmany = 0;
+
+        llinfos << "TEXTURE CACHE: " << mFilesToDelete.size() << " files scheduled for deletion" << llendl;
+
+        for (LLTextureCache::filename_list_t::iterator iter = mFilesToDelete.begin(); iter!=mFilesToDelete.end(); ) 
+        {       
+                LLTextureCache::filename_list_t::iterator iter2 = iter++;
+                ll_apr_file_remove(*iter2, NULL);
+                mFilesToDelete.erase(iter2);
+                howmany++;
+
+                if (!force_all && timer.getElapsedTimeF32() > max_time_per_pass) 
+                {
+                        break;
+                }
+        }
+
+        if (!mFilesToDelete.empty())
+        {
+                llinfos << "TEXTURE CACHE: "<< howmany << " files deleted (" 
+                                << mFilesToDelete.size() << " files left for next pass)" 
+                                << llendl;
+        }
+
+        mTimeLastFileDelete.reset();
+}
+
+
+
 //////////////////////////////////////////////////////////////////////////////
 
 // call lockWorkers() first!
@@ -1462,6 +1511,10 @@ LLTextureCache::handle_t LLTextureCache::writeToCache(const LLUUID& id, U32 prio
                 purgeTextures(false);
                 mDoPurge = FALSE;
         }
+
+        purgeTextureFilesTimeSliced();  // purge textures from cache in a non-hiccup-way
+
+
         if (datasize >= TEXTURE_CACHE_ENTRY_SIZE)
         {
                 LLMutexLock lock(&mWorkersMutex);
diff --git a/linden/indra/newview/lltexturecache.h b/linden/indra/newview/lltexturecache.h
index f083dd0..e15a88b 100644
--- a/linden/indra/newview/lltexturecache.h
+++ b/linden/indra/newview/lltexturecache.h
@@ -119,6 +119,7 @@ private:
         void readHeaderCache(apr_pool_t* poolp = NULL);
         void purgeAllTextures(bool purge_directories);
         void purgeTextures(bool validate);
+        void purgeTextureFilesTimeSliced(BOOL force_all = FALSE);
         S32 getHeaderCacheEntry(const LLUUID& id, bool touch, S32* imagesize = NULL);
         bool removeHeaderCacheEntry(const LLUUID& id);
         void lockHeaders() { mHeaderMutex.lock(); }
@@ -140,6 +141,10 @@ private:
 
         typedef std::vector<std::pair<LLPointer<Responder>, bool> > responder_list_t;
         responder_list_t mCompletedList;
+
+        typedef std::list<std::string> filename_list_t;
+        filename_list_t mFilesToDelete;
+        LLTimer mTimeLastFileDelete;
         
         BOOL mReadOnly;