コード例 #1
0
ファイル: mem_usage.go プロジェクト: knz/cockroach
// releaseMemory releases memory previously successfully registered
// via reserveMemory().
func (mm *MemoryMonitor) releaseMemory(ctx context.Context, sz int64) {
	mm.mu.Lock()
	defer mm.mu.Unlock()
	if mm.mu.curAllocated < sz {
		panic(fmt.Sprintf("%s: no memory to release, current %d, free %d",
			mm.name, mm.mu.curAllocated, sz))
	}
	mm.mu.curAllocated -= sz
	if mm.curBytesCount != nil {
		mm.curBytesCount.Dec(sz)
	}
	mm.adjustBudget(ctx)

	if log.V(2) {
		// We avoid VEventf here because we want to avoid computing the
		// trace string if there is nothing to log.
		log.Infof(ctx, "%s: now at %d bytes (-%d) - %s",
			mm.name, mm.mu.curAllocated, sz, util.GetSmallTrace(3))
	}
}
コード例 #2
0
ファイル: mem_usage.go プロジェクト: knz/cockroach
// reserveMemory declares an allocation to this monitor. An error is
// returned if the allocation is denied.
func (mm *MemoryMonitor) reserveMemory(ctx context.Context, x int64) error {
	mm.mu.Lock()
	defer mm.mu.Unlock()
	if mm.mu.curAllocated > mm.mu.curBudget.curAllocated+mm.reserved.curAllocated-x {
		if err := mm.increaseBudget(ctx, x); err != nil {
			return err
		}
	}
	mm.mu.curAllocated += x
	if mm.curBytesCount != nil {
		mm.curBytesCount.Inc(x)
	}
	if mm.mu.maxAllocated < mm.mu.curAllocated {
		mm.mu.maxAllocated = mm.mu.curAllocated
	}

	// Report "large" queries to the log for further investigation.
	if mm.mu.curAllocated > mm.noteworthyUsageBytes {
		// We only report changes in binary magnitude of the size.  This
		// is to limit the amount of log messages when a size blowup is
		// caused by many small allocations.
		if util.RoundUpPowerOfTwo(mm.mu.curAllocated) != util.RoundUpPowerOfTwo(mm.mu.curAllocated-x) {
			log.Infof(ctx, "%s: memory usage increases to %s (+%d)",
				mm.name,
				humanizeutil.IBytes(mm.mu.curAllocated), x)
		}
	}

	if log.V(2) {
		// We avoid VEventf here because we want to avoid computing the
		// trace string if there is nothing to log.
		log.Infof(ctx, "%s: now at %d bytes (+%d) - %s",
			mm.name, mm.mu.curAllocated, x, util.GetSmallTrace(3))
	}
	return nil
}