Data_Namespace::ProcBuddyinfoParser Class Reference

Parse /proc/buddyinfo into a few fragmentation-related data. More...

#include <DataMgr.h>

Public Member Functions
void	parseBuddyinfo ()
double	getFragmentationPercent () const
size_t	getSumAvailPages () const
size_t	getSumHighestBlocks () const

Private Attributes
double	frag_percent_ {0}
size_t	sum_avail_pages_ {0}
size_t	sum_highest_blocks_ {0}

Detailed Description

Parse /proc/buddyinfo into a few fragmentation-related data.

Definition at line 112 of file DataMgr.h.

Member Function Documentation

double Data_Namespace::ProcBuddyinfoParser::getFragmentationPercent ( ) const

inline

Definition at line 115 of file DataMgr.h.

References frag_percent_.

{ return frag_percent_; }

size_t Data_Namespace::ProcBuddyinfoParser::getSumAvailPages ( ) const

inline

Definition at line 116 of file DataMgr.h.

References sum_avail_pages_.

{ return sum_avail_pages_; }

size_t Data_Namespace::ProcBuddyinfoParser::getSumHighestBlocks ( ) const

inline

Definition at line 117 of file DataMgr.h.

References sum_highest_blocks_.

{ return sum_highest_blocks_; }

void Data_Namespace::ProcBuddyinfoParser::parseBuddyinfo

(

)

Definition at line 846 of file DataMgr.cpp.

References frag_percent_, Data_Namespace::anonymous_namespace{DataMgr.cpp}::kErrorCodeUnableToOpenFile, parse_ast::line, sum_avail_pages_, sum_highest_blocks_, and Data_Namespace::anonymous_namespace{DataMgr.cpp}::tokenize().

Referenced by Data_Namespace::DataMgr::getSystemMemoryUsage().

                                         {
  std::ifstream file("/proc/buddyinfo");
  if (!file.is_open()) {
    frag_percent_ = kErrorCodeUnableToOpenFile;
    sum_highest_blocks_ = 0;
    return;
  }

  constexpr unsigned max_line_size = 256;
  char line[max_line_size];

  BuddyinfoBlocks frag;  // Used to calculate frag_percent_.

  // Example: line = "Node 0, zone Normal 1 2 3 4 5 6 7 8 9 10 11"
  // No CHECKs are done, and no exceptions are thrown. The worst that can happen is
  // bad logs, which is not worth crashing the server or showing an error to the user.
  while (file.getline(line, max_line_size)) {
    auto tokens = tokenize(line);  // Split on spaces.
    // Sanity check on tokens.size() and known tokens.
    if (5u <= tokens.size() && tokens[0] == "Node" && tokens[2] == "zone") {
      BuddyinfoBlocks row(tokens.data() + 4, tokens.size() - 4);

      // Calculate member variables
      frag.addBlocks(row);
      if (tokens[3].substr(0, 3) != "DMA") {
        sum_avail_pages_ += row.sumAvailPages();
        sum_highest_blocks_ += row.highestBlock();
      }
    }
  }
  frag_percent_ = frag.fragPercent();
}

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Member Data Documentation

double Data_Namespace::ProcBuddyinfoParser::frag_percent_ {0}

private

Definition at line 120 of file DataMgr.h.

Referenced by getFragmentationPercent(), and parseBuddyinfo().

size_t Data_Namespace::ProcBuddyinfoParser::sum_avail_pages_ {0}

private

Definition at line 121 of file DataMgr.h.

Referenced by getSumAvailPages(), and parseBuddyinfo().

size_t Data_Namespace::ProcBuddyinfoParser::sum_highest_blocks_ {0}

private

Definition at line 122 of file DataMgr.h.

Referenced by getSumHighestBlocks(), and parseBuddyinfo().

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The documentation for this class was generated from the following files:

• /home/jenkins-slave/workspace/core-os-doxygen/DataMgr/DataMgr.h
• /home/jenkins-slave/workspace/core-os-doxygen/DataMgr/DataMgr.cpp