On 2013/10/11 08:27:11, Hannes Payer wrote:
On 2013/10/11 05:59:32, loislo wrote:
> On 2013/10/10 18:54:39, Hannes Payer wrote:
> > I would propose to turn off allocation folding when you turn on object
> tracking
> > and vice versa. FLAG_use_allocation_folding = false
> > Doing that will give you all the objects with corresponding sizes.
>
> If the flag doesn't change the sizes or count of the objects in the
heap we
will
> use it.
> Otherwise that trick will give us the results that doesn't reflect the
real
> 'allocations picture' for the page.
The flag does not change the size and objects that get allocated. It may
just
result
in more memory fragmentation when folding is turned on. For example,
new A()
if (condition)
new B()
else
new C()
Folding will allocate A+B+C together but will later at runtime only use
A+B or
A+C. B or C will be fragmentation, there will not be an objects at that
location,
just free space filler memory.
I guess it is fine to turn it off.
I agree that it would be fine to turn this optimization off when tracking
allocations. Can you provide some pointers on where to put the flag
disabling
coalesced allocations in the optimizing copiler?
https://codereview.chromium.org/22852024/
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