tree 8552d3f59307098dca69bfbcf64228c2c70c2496
parent 4f4a6c47ef269c68bc136f0805e5e99512d970b7
author Vladimir Marko <vmarko@google.com> 1461344833 +0100
committer Vladimir Marko <vmarko@google.com> 1461589076 +0100

Reduce memory lost by ArenaAllocator for large allocations.

When allocating from a new arena, check if the old arena has
more remaining space than the new one after the current
allocation. If so, keep using the old arena to reduce the
amount of "lost" arena memory. This can happen when we try
to allocate more than half the default arena size. If the
allocation exceeds the default arena size, it's very likely
to happen even though the ArenaPool could still provide some
much larger previously allocated arena.

Also avoid artithmetic overflow when checking if the
request can be satisfied from the current arena.
And abort immediately if calloc() fails.

Bug: 28173563
Bug: 28256882
Change-Id: I1b4bda5d3f32ecd95fbd11addd1f0ca6dcc33e45