Added PrintSummary() private method.

Closes #27.
xvitaly · Apr 26, 2020 · da2fb4d · da2fb4d
1 parent 94a1dac
commit da2fb4d
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Showing 4 changed files with 40 additions and 0 deletions.
diff --git a/src/app/application/application.cpp b/src/app/application/application.cpp
@@ -76,6 +76,35 @@ void Application::PrintSettings()
               << std::endl;
 }
 
+void Application::PrintSummary()
+{
+    ZSwapDebug ZSwapDebugger;
+    KSysInfo SysInfo;
+
+    if (ZSwapDebugger.GetPoolTotalSize() == 0)
+    {
+        std::cerr << "ZSwap is not working. The pool is empty." << std::endl;
+        return;
+    }
+
+    constexpr const long Power = 1024 << 10;
+    const float PoolSizeMB = static_cast<float>(ZSwapDebugger.GetPoolTotalSize()) / Power;
+    const float MemTotalPercent = static_cast<float>(ZSwapDebugger.GetPoolTotalSize()) / static_cast<float>(SysInfo.GetTotalRam()) * 100.f;
+    const float StoredPagesMB = static_cast<float>(ZSwapDebugger.GetStoredPages() * CWrappers::GetSCPageSize()) / Power;
+    const float SwapUsedPercent = static_cast<float>(ZSwapDebugger.GetStoredPages() * CWrappers::GetSCPageSize()) / static_cast<float>(SysInfo.GetTotalSwap() - SysInfo.GetFreeSwap()) * 100.f;
+    const float CompressionRatio = StoredPagesMB / PoolSizeMB;
+
+    std::cout << fmt::format("Pool: {0:.2f} MiB ({1:.1f}% of MemTotal)\n"
+                             "Stored: {2:.2f} MiB ({3:.1f}% of SwapUsed)\n"
+                             "Comression ratio: {4:.2f}",
+                             PoolSizeMB,
+                             MemTotalPercent,
+                             StoredPagesMB,
+                             SwapUsedPercent,
+                             CompressionRatio)
+              << std::endl;
+}
+
 void Application::PrintCombined()
 {
     std::cout << "ZSWAP KERNEL MODULE SETTINGS:" << std::endl;
@@ -98,6 +127,9 @@ int Application::PrintStats(const int Value)
         case 2:
             PrintDebugInfo();
             break;
+        case 3:
+            PrintSummary();
+            break;
         default:
             std::cout << "Incorrect value of --stats command-line option was specified." << std::endl;
     }

diff --git a/src/app/application/application.hpp b/src/app/application/application.hpp
@@ -30,6 +30,7 @@
 #include "cwrappers/cwrappers.hpp"
 #include "zswapobject/zswapobject.hpp"
 #include "zswapdebug/zswapdebug.hpp"
+#include "ksysinfo/ksysinfo.hpp"
 
 class Application
 {
@@ -43,6 +44,7 @@ class Application
     void ExecuteCmdLine(const cxxopts::ParseResult&);
     void PrintDebugInfo();
     void PrintSettings();
+    void PrintSummary();
     void PrintCombined();
     int PrintStats(int);
 };

diff --git a/src/lib/cwrappers/cwrappers.cpp b/src/lib/cwrappers/cwrappers.cpp
@@ -32,3 +32,8 @@ bool CWrappers::CheckRoot()
 {
     return getuid();
 }
+
+long CWrappers::GetSCPageSize()
+{
+    return sysconf(_SC_PAGESIZE);
+}
diff --git a/src/lib/cwrappers/cwrappers.hpp b/src/lib/cwrappers/cwrappers.hpp
@@ -31,6 +31,7 @@ class CWrappers
 public:
     static std::string GetEnv(const std::string&);
     static bool CheckRoot();
+    static long GetSCPageSize();
 private:
     CWrappers() = default;
 };