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authorAlex Bennée <alex.bennee@linaro.org>2020-07-24 07:44:59 +0100
committerAlex Bennée <alex.bennee@linaro.org>2020-07-27 09:40:16 +0100
commitc83d628b7fba050e59ccf7bda050bc27af241b61 (patch)
tree40ca20b11478b5bbead95b73fc054ca2cd97b5cb /accel
parent986babaab30279a4962648d03730bf1291d89f93 (diff)
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accel/tcg: better handle memory constrained systems
It turns out there are some 64 bit systems that have relatively low amounts of physical memory available to them (typically CI system). Even with swapping available a 1GB translation buffer that fills up can put the machine under increased memory pressure. Detect these low memory situations and reduce tb_size appropriately. Fixes: 600e17b2615 ("accel/tcg: increase default code gen buffer size for 64 bit") Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Robert Foley <robert.foley@linaro.org> Cc: BALATON Zoltan <balaton@eik.bme.hu> Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com> Message-Id: <20200724064509.331-7-alex.bennee@linaro.org>
Diffstat (limited to 'accel')
-rw-r--r--accel/tcg/translate-all.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 2afa46b..2d83013 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -976,7 +976,12 @@ static inline size_t size_code_gen_buffer(size_t tb_size)
{
/* Size the buffer. */
if (tb_size == 0) {
- tb_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
+ size_t phys_mem = qemu_get_host_physmem();
+ if (phys_mem == 0) {
+ tb_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
+ } else {
+ tb_size = MIN(DEFAULT_CODE_GEN_BUFFER_SIZE, phys_mem / 8);
+ }
}
if (tb_size < MIN_CODE_GEN_BUFFER_SIZE) {
tb_size = MIN_CODE_GEN_BUFFER_SIZE;