[External] : RE: RFC: x86_64: Fixing the align() macro

[dean.long at oracle.com]

Hi Scott,


On 8/24/21 8:07 AM, Gibbons, Scott wrote:

> Allocating all segment buffers with 64-byte alignment would be easier


yes.  Are there any disadvantages (see below)?


> and less wasteful of memory.


I disagree, unless you expect most methods to require the higher 
alignment.  Also, I'm worried about icache performance.  We have tricks 
in the JVM to adjust field offsets to decrease dcache conflicts.  
Doesn't increasing the code alignment have the same negative affect on 
the icache?  Have you tried a prototype and collected performance numbers?

dl