Android Perfetto 系列 14：heapprofd 与内存 Profiling

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WITH target_process AS (
  SELECT upid, pid, name
  FROM process
  WHERE name = 'com.example.app'
  ORDER BY start_ts DESC
  LIMIT 1
),
selected_dumps(label, dump_ts) AS (
  VALUES
    ('baseline', 100000000000),
    ('after_action', 120000000000),
    ('after_release', 150000000000)
),
valid_dumps AS (
  SELECT d.* FROM selected_dumps d
  WHERE EXISTS (
    SELECT 1 FROM heap_profile h
    WHERE h.upid = (SELECT upid FROM target_process)
      AND h.heap_name = 'libc.malloc' AND h.ts_end = d.dump_ts
  )
),
alloc_by_dump AS (
  SELECT
    d.label,
    a.callsite_id,
    SUM(a.size) / 1024.0 / 1024.0 AS unreleased_mb,
    SUM(a.count) AS unreleased_count
  FROM heap_profile_allocation a
  JOIN valid_dumps d ON a.ts <= d.dump_ts
  WHERE a.upid = (SELECT upid FROM target_process)
    AND a.heap_name = 'libc.malloc'
  GROUP BY d.label, a.callsite_id
),
pivot AS (
  SELECT
    callsite_id,
    SUM(CASE WHEN label = 'baseline' THEN unreleased_mb ELSE 0 END) AS baseline_unreleased_mb,
    SUM(CASE WHEN label = 'after_action' THEN unreleased_mb ELSE 0 END) AS after_action_unreleased_mb,
    SUM(CASE WHEN label = 'after_release' THEN unreleased_mb ELSE 0 END) AS after_release_unreleased_mb
  FROM alloc_by_dump
  GROUP BY callsite_id
)
SELECT
  callsite_id,
  baseline_unreleased_mb,
  after_action_unreleased_mb,
  after_release_unreleased_mb,
  after_action_unreleased_mb - baseline_unreleased_mb AS action_delta_mb,
  after_release_unreleased_mb - baseline_unreleased_mb AS retained_delta_mb,
  after_action_unreleased_mb - after_release_unreleased_mb AS released_delta_mb,
  CASE
    WHEN after_release_unreleased_mb - baseline_unreleased_mb > 1 THEN 'leak_candidate'
    WHEN after_action_unreleased_mb > baseline_unreleased_mb
      AND after_release_unreleased_mb <= baseline_unreleased_mb THEN 'peak'
    ELSE 'unknown'
  END AS conclusion_type
FROM pivot
WHERE (SELECT COUNT(*) FROM valid_dumps) = 3
ORDER BY retained_delta_mb DESC
LIMIT 50;

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trace_name,process_name,upid,pid,scenario,dump_phase,dump_ts_ms,sampling_interval_bytes,dump_interval_ms,top_stack_frame,mapping_name,unreleased_mb,retained_delta_mb,total_malloc_mb,allocation_count,symbol_status,profileable_state,data_loss_status,evidence_grade,conclusion_type,next_action
heap-run01,com.example.app,42,1234,player_open,after_release,150000,4096,5000,PlayerBuffer::Alloc,libplayer.so,8.4,6.9,42.1,128,strong,profileable,clean,strong,leak_candidate,inspect_owner_module