52 lines
1.6 KiB
Ruby
52 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Memory
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class Watchdog
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module Monitor
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# A monitor that observes Ruby heap fragmentation and calls
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# memory_violation_callback when the Ruby heap has been fragmented for an extended
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# period of time.
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#
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# See Gitlab::Metrics::Memory for how heap fragmentation is defined.
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class HeapFragmentation
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attr_reader :max_heap_fragmentation
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# max_heap_fragmentation:
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# The degree to which the Ruby heap is allowed to be fragmented. Range [0,1].
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def initialize(max_heap_fragmentation:)
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@max_heap_fragmentation = max_heap_fragmentation
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init_frag_limit_metrics
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end
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def call
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heap_fragmentation = Gitlab::Metrics::Memory.gc_heap_fragmentation
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return { threshold_violated: false, payload: {} } if heap_fragmentation <= max_heap_fragmentation
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{ threshold_violated: true, payload: payload(heap_fragmentation) }
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end
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private
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def payload(heap_fragmentation)
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{
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message: 'heap fragmentation limit exceeded',
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memwd_cur_heap_frag: heap_fragmentation,
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memwd_max_heap_frag: max_heap_fragmentation
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}
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end
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def init_frag_limit_metrics
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heap_frag_limit = Gitlab::Metrics.gauge(
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:gitlab_memwd_heap_frag_limit,
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'The configured limit for how fragmented the Ruby heap is allowed to be'
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)
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heap_frag_limit.set({}, max_heap_fragmentation)
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end
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end
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end
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end
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end
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end
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