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Re: [PATCH] malloc: Preseve arena free list for attached threads [BZ #20370]


On 07/19/2016 08:35 PM, Carlos O'Donell wrote:
OK. This should really be an infrequent operation triggered only by
failing allocations in your main arena e.g. arena_get_retry, or as a thread
is started up and looking for a free list. I would imagine that the cost of
this linear list walk (which grows by CPU count) would be nothing compared to
the cost of starting up and tearing down threads.

NB: Note that this only happens after the current thread lost a race towards the free list, and some other thread exited between the point where the current thread observed the free list as empty (because otherwise the current thread would have picked an arena from the non-empty free list), and the current thread attaches itself to the selected arena.

Florian


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