Add a few histograms to the disk cache.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@735 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 17 insertions, 0 deletions

diff --git a/net/disk_cache/entry_impl.cc b/net/disk_cache/entry_impl.cc
index 58509c1..3d3ada2 100644
--- a/net/disk_cache/entry_impl.cc
+++ b/net/disk_cache/entry_impl.cc
@@ -29,6 +29,7 @@
 
 #include "net/disk_cache/entry_impl.h"
 
+#include "base/histogram.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "net/base/net_errors.h"
@@ -122,6 +123,8 @@ EntryImpl::EntryImpl(BackendImpl* backend, Addr address)
 // written before).
 EntryImpl::~EntryImpl() {
   if (doomed_) {
+    UMA_HISTOGRAM_COUNTS(L"DiskCache.DeleteHeader", GetDataSize(0));
+    UMA_HISTOGRAM_COUNTS(L"DiskCache.DeleteData", GetDataSize(1));
     for (int index = 0; index < kKeyFileIndex; index++) {
       Addr address(entry_.Data()->data_addr[index]);
       if (address.is_initialized()) {
@@ -239,6 +242,11 @@ int EntryImpl::ReadData(int index, int offset, char* buf, int buf_len,
   if (buf_len < 0)
     return net::ERR_INVALID_ARGUMENT;
 
+  Time start = Time::Now();
+  static Histogram stats(L"DiskCache.ReadTime", TimeDelta::FromMilliseconds(1),
+                         TimeDelta::FromSeconds(10), 50);
+  stats.SetFlags(kUmaTargetedHistogramFlag);
+
   if (offset + buf_len > entry_size)
     buf_len = entry_size - offset;
 
@@ -250,6 +258,7 @@ int EntryImpl::ReadData(int index, int offset, char* buf, int buf_len,
     // Complete the operation locally.
     DCHECK(kMaxBlockSize >= offset + buf_len);
     memcpy(buf , user_buffers_[index].get() + offset, buf_len);
+    stats.AddTime(Time::Now() - start);
     return buf_len;
   }
 
@@ -281,6 +290,7 @@ int EntryImpl::ReadData(int index, int offset, char* buf, int buf_len,
   if (io_callback && completed)
     io_callback->Discard();
 
+  stats.AddTime(Time::Now() - start);
   return (completed || !completion_callback) ? buf_len : net::ERR_IO_PENDING;
 }
 
@@ -306,6 +316,11 @@ int EntryImpl::WriteData(int index, int offset, const char* buf, int buf_len,
     return net::ERR_FAILED;
   }
 
+  Time start = Time::Now();
+  static Histogram stats(L"DiskCache.WriteTime", TimeDelta::FromMilliseconds(1),
+                         TimeDelta::FromSeconds(10), 50);
+  stats.SetFlags(kUmaTargetedHistogramFlag);
+
   // Read the size at this point (it may change inside prepare).
   int entry_size = entry_.Data()->data_size[index];
   if (!PrepareTarget(index, offset, buf_len, truncate))
@@ -337,6 +352,7 @@ int EntryImpl::WriteData(int index, int offset, const char* buf, int buf_len,
     // Complete the operation locally.
     DCHECK(kMaxBlockSize >= offset + buf_len);
     memcpy(user_buffers_[index].get() + offset, buf, buf_len);
+    stats.AddTime(Time::Now() - start);
     return buf_len;
   }
 
@@ -371,6 +387,7 @@ int EntryImpl::WriteData(int index, int offset, const char* buf, int buf_len,
   if (io_callback && completed)
     io_callback->Discard();
 
+  stats.AddTime(Time::Now() - start);
   return (completed || !completion_callback) ? buf_len : net::ERR_IO_PENDING;
 }