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[PATCH v2 06/12] accel/tcg: better handle memory constrained systems
From: |
Alex Bennée |
Subject: |
[PATCH v2 06/12] accel/tcg: better handle memory constrained systems |
Date: |
Wed, 22 Jul 2020 07:28:56 +0100 |
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: 600e17b261
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: BALATON Zoltan <balaton@eik.bme.hu>
Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Message-Id: <20200717105139.25293-6-alex.bennee@linaro.org>
---
v2
- /4 to /8 as suggested by Christian
---
accel/tcg/translate-all.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 2afa46bd2b1..3fe40ec1710 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 && phys_mem < (2 * DEFAULT_CODE_GEN_BUFFER_SIZE)) {
+ tb_size = phys_mem / 8;
+ } else {
+ tb_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
+ }
}
if (tb_size < MIN_CODE_GEN_BUFFER_SIZE) {
tb_size = MIN_CODE_GEN_BUFFER_SIZE;
--
2.20.1
- [PATCH v2 00/12] candidate fixes for 5.1-rc1 (testing, semihosting, OOM tcg, x86 fpu), Alex Bennée, 2020/07/22
- [PATCH v2 01/12] shippable: add one more qemu to registry url, Alex Bennée, 2020/07/22
- [PATCH v2 02/12] semihosting: defer connect_chardevs a little more to use serialx, Alex Bennée, 2020/07/22
- [PATCH v2 04/12] util: add qemu_get_host_physmem utility function, Alex Bennée, 2020/07/22
- [PATCH v2 03/12] semihosting: don't send the trailing '\0', Alex Bennée, 2020/07/22
- [PATCH v2 06/12] accel/tcg: better handle memory constrained systems,
Alex Bennée <=
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Richard Henderson, 2020/07/22
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Alex Bennée, 2020/07/22
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Daniel P . Berrangé, 2020/07/22
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Richard Henderson, 2020/07/22
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Daniel P . Berrangé, 2020/07/23
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Alex Bennée, 2020/07/23
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Daniel P . Berrangé, 2020/07/23
- Re: [PATCH v2 06/12] accel/tcg: better handle memory constrained systems, Alex Bennée, 2020/07/23
[PATCH v2 05/12] util/oslib-win32: add qemu_get_host_physmem implementation, Alex Bennée, 2020/07/22