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exec: Advise huge pages for the TCG code gen buffer 

After allocating 32MB or more contiguous memory, huge pages
would seem to be ideal.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2012-11-02 09:20:46 +11:00 committed by Blue Swirl
parent 16c6c80ac3
commit 0be4835b49
1 changed files with 2 additions and 0 deletions
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exec.c
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@ -607,6 +607,8 @@ static inline void code_gen_alloc(size_t tb_size)
exit(1);
}
qemu_madvise(code_gen_buffer, code_gen_buffer_size, QEMU_MADV_HUGEPAGE);
/* Steal room for the prologue at the end of the buffer. This ensures
(via the MAX_CODE_GEN_BUFFER_SIZE limits above) that direct branches
from TB's to the prologue are going to be in range. It also means