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Add support for Linux per-process IO statistics,

Browse Source 
enabled with the --enable-taskstats flag, which
requires a kernel compiled with taskstats support.
Thanks to Tobias Oetiker!
This commit is contained in:
Hisham Muhammad
2008-03-09 08:02:22 +00:00
parent 460608d6e2
commit 12f4f09e6e
6 changed files with 149 additions and 4 deletions
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48
ProcessList.c
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@ -499,6 +499,50 @@ bool ProcessList_readStatusFile(ProcessList* this, Process* proc, char* dirname,
return true;
}
#ifdef HAVE_TASKSTATS
void ProcessList_readIoFile(ProcessList* this, Process* proc, char* dirname, char* name) {
char iofilename[MAX_NAME+1];
iofilename[MAX_NAME] = '\0';
char buffer[256];
buffer[255] = '\0';
snprintf(iofilename, MAX_NAME, "%s/%s/io", dirname, name);
FILE* io = ProcessList_fopen(this, iofilename, "r");
if (io) {
struct timeval tv;
gettimeofday(&tv,NULL);
unsigned long long now = tv.tv_sec*1000+tv.tv_usec/1000;
unsigned long long last_read = proc->io_read_bytes;
unsigned long long last_write = proc->io_write_bytes;
while (!feof(io)) {
char* ok = fgets(buffer, 255, io);
if (!ok)
break;
if (ProcessList_read(this, buffer, "rchar: %llu", &proc->io_rchar)) continue;
if (ProcessList_read(this, buffer, "wchar: %llu", &proc->io_wchar)) continue;
if (ProcessList_read(this, buffer, "syscr: %llu", &proc->io_syscr)) continue;
if (ProcessList_read(this, buffer, "syscw: %llu", &proc->io_syscw)) continue;
if (ProcessList_read(this, buffer, "read_bytes: %llu", &proc->io_read_bytes)) {
proc->io_rate_read_bps =
((double)(proc->io_read_bytes - last_read))/(((double)(now - proc->io_rate_read_time))/1000);
proc->io_rate_read_time = now;
continue;
}
if (ProcessList_read(this, buffer, "write_bytes: %llu", &proc->io_write_bytes)) {
proc->io_rate_write_bps =
((double)(proc->io_write_bytes - last_write))/(((double)(now - proc->io_rate_write_time))/1000);
proc->io_rate_write_time = now;
continue;
}
ProcessList_read(this, buffer, "cancelled_write_bytes: %llu", &proc->io_cancelled_write_bytes);
}
fclose(io);
}
}
#endif
bool ProcessList_processEntries(ProcessList* this, char* dirname, Process* parent, float period) {
DIR* dir;
struct dirent* entry;
@ -547,6 +591,10 @@ bool ProcessList_processEntries(ProcessList* this, char* dirname, Process* paren
}
}
#ifdef HAVE_TASKSTATS
ProcessList_readIoFile(this, process, dirname, name);
#endif
if (showUserlandThreads && (!parent || pid != parent->pid)) {
char subdirname[MAX_NAME+1];
snprintf(subdirname, MAX_NAME, "%s/%s/task", dirname, name);