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runtime: increase number of stack orders to 4

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Cache 2KB, 4KB, 8KB, and 16KB stacks.  Larger stacks
will be allocated directly.  There is no point in cacheing
32KB+ stacks as we ask for and return 32KB at a time
from the allocator.

Note that the minimum stack is 8K on windows/64bit and 4K on
windows/32bit and plan9.  For these os/arch combinations,
the number of stack orders is less so that we have the same
maximum cached size.

Fixes #9045

Change-Id: Ia4195dd1858fb79fc0e6a91ae29c374d28839e44
Reviewed-on: https://go-review.googlesource.com/2098
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Keith Randall 2014-12-26 18:10:59 -08:00
parent ce36552083
commit 5aae246f1e
1 changed files with 11 additions and 1 deletions
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12
src/runtime/malloc2.go
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@ -117,7 +117,17 @@ const (
// Number of orders that get caching. Order 0 is FixedStack
// and each successive order is twice as large.
_NumStackOrders = 3
// We want to cache 2KB, 4KB, 8KB, and 16KB stacks. Larger stacks
// will be allocated directly.
// Since FixedStack is different on different systems, we
// must vary NumStackOrders to keep the same maximum cached size.
// OS | FixedStack | NumStackOrders
// -----------------+------------+---------------
// linux/darwin/bsd | 2KB | 4
// windows/32 | 4KB | 3
// windows/64 | 8KB | 2
// plan9 | 4KB | 3
_NumStackOrders = 4 - ptrSize/4*goos_windows - 1*goos_plan9
// Number of bits in page to span calculations (4k pages).
// On Windows 64-bit we limit the arena to 32GB or 35 bits.