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tcg: Increase the highwater reservation 

If there are a lot of guest memory ops in the TB, the amount of
code generated by tcg_out_tb_finalize could be well more than 1k.
In the short term, increase the reservation larger than any TB
seen in practice.

Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
stable-2.5
Richard Henderson 2015-12-01 08:10:28 -08:00
parent a2485925f7
commit b17a6d3390
1 changed files with 5 additions and 1 deletions
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6
tcg/tcg.c
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@ -388,7 +388,11 @@ void tcg_prologue_init(TCGContext *s)
/* Compute a high-water mark, at which we voluntarily flush the buffer
and start over. The size here is arbitrary, significantly larger
than we expect the code generation for any one opcode to require. */
s->code_gen_highwater = s->code_gen_buffer + (total_size - 1024);
/* ??? We currently have no good estimate for, or checks in,
tcg_out_tb_finalize. If there are quite a lot of guest memory ops,
the number of out-of-line fragments could be quite high. In the
short-term, increase the highwater buffer. */
s->code_gen_highwater = s->code_gen_buffer + (total_size - 64*1024);
tcg_register_jit(s->code_gen_buffer, total_size);