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SubjectRe: slab redzoning
William Lee Irwin III wrote:

>-if ((size < 4096 || fls(size-1) == fls(size-1+3*BYTES_PER_WORD)))
>+if (size + 3*BYTES_PER_WORD <= PAGE_SIZE ||
>
I understand this change: objects between 4082 and 4095 bytes are
redzoned and cause order==1 allocations, that's wrong.

>+ ((size & (size - 1)) &&
>+ (1 << fls(size)) - size > 3*BYTES_PER_WORD))
>
Why this change? I've tested my fls(size-1)==fls(size-1-3*4) approach
and it always returned the right result: No redzoning between 8181 and
8192 bytes, between 16373 and 16384, etc.

--
Manfred

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