content: {-# LANGUAGE Trustworthy #-}
  {-# LANGUAGE NoImplicitPrelude #-}
  
  -- | @since base-4.7.0.0
  module GHC.Internal.Profiling ( -- * Cost Centre Profiling
                         startProfTimer
                       , stopProfTimer
                         -- * Heap Profiling
                       , startHeapProfTimer
                       , stopHeapProfTimer
                       , requestHeapCensus
                         -- * Ticky counters (eventlog)
                       , requestTickyCounterSamples
                       )where
  
  import GHC.Internal.Base
  
  -- | Stop attributing ticks to cost centres. Allocations will still be
  -- attributed.
  --
  -- @since base-4.7.0.0
  foreign import ccall stopProfTimer :: IO ()
  
  -- | Start attributing ticks to cost centres. This is called by the RTS on
  -- startup but can be disabled using the rts flag @--no-automatic-time-samples@.
  --
  -- @since base-4.7.0.0
  foreign import ccall startProfTimer :: IO ()
  
  -- | Request a heap census on the next context switch. The census can be
  -- requested whether or not the heap profiling timer is running.
  --
  -- Note: This won't do anything unless you also specify a profiling mode on the
  -- command line using the normal RTS options.
  --
  -- @since base-4.16.0.0
  foreign import ccall requestHeapCensus :: IO ()
  
  -- | Start heap profiling. This is called normally by the RTS on start-up,
  -- but can be disabled using the rts flag @--no-automatic-heap-samples@.
  --
  -- Note: This won't do anything unless you also specify a profiling mode on the
  -- command line using the normal RTS options.
  --
  -- @since base-4.16.0.0
  foreign import ccall startHeapProfTimer :: IO ()
  
  -- | Stop heap profiling.
  --
  -- Note: This won't do anything unless you also specify a profiling mode on the
  -- command line using the normal RTS options.
  --
  -- @since base-4.16.0.0
  foreign import ccall stopHeapProfTimer :: IO ()
  
  -- | Request ticky counter samples to be written to the eventlog.
  --
  -- Note: This won't do anything unless you have specified RTS options on
  -- the command line to log ticky samples to the eventlog.
  --
  -- @since base-4.20.0.0
  
  foreign import ccall requestTickyCounterSamples :: IO ()
  