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From: "Alex Bennée" <alex.bennee@linaro.org>
To: qemu-devel@nongnu.org
Cc: "Philippe Mathieu-Daudé" <philmd@redhat.com>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	"Niek Linnenbank" <nieklinnenbank@gmail.com>,
	qemu-arm@nongnu.org, "Paolo Bonzini" <pbonzini@redhat.com>,
	"Igor Mammedov" <imammedo@redhat.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Richard Henderson" <rth@twiddle.net>
Subject: [PATCH v2 2/4] accel/tcg: remove link between guest ram and TCG cache size
Date: Fri, 28 Feb 2020 19:24:13 +0000	[thread overview]
Message-ID: <20200228192415.19867-3-alex.bennee@linaro.org> (raw)
In-Reply-To: <20200228192415.19867-1-alex.bennee@linaro.org>

Basing the TB cache size on the ram_size was always a little heuristic
and was broken by a1b18df9a4 which caused ram_size not to be fully
realised at the time we initialise the TCG translation cache.

The current DEFAULT_CODE_GEN_BUFFER_SIZE may still be a little small
but follow-up patches will address that.

Fixes: a1b18df9a4
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Niek Linnenbank <nieklinnenbank@gmail.com>
Cc: Igor Mammedov <imammedo@redhat.com>
---
 accel/tcg/translate-all.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 238b0e575bf..5b66af783b5 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -938,15 +938,7 @@ static inline size_t size_code_gen_buffer(size_t tb_size)
 {
     /* Size the buffer.  */
     if (tb_size == 0) {
-#ifdef USE_STATIC_CODE_GEN_BUFFER
         tb_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
-#else
-        /* ??? Needs adjustments.  */
-        /* ??? If we relax the requirement that CONFIG_USER_ONLY use the
-           static buffer, we could size this on RESERVED_VA, on the text
-           segment size of the executable, or continue to use the default.  */
-        tb_size = (unsigned long)(ram_size / 4);
-#endif
     }
     if (tb_size < MIN_CODE_GEN_BUFFER_SIZE) {
         tb_size = MIN_CODE_GEN_BUFFER_SIZE;
-- 
2.20.1



  parent reply	other threads:[~2020-02-28 19:27 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-28 19:24 [PATCH v2 0/4] Clean-up codegen cache size Alex Bennée
2020-02-28 19:24 ` [PATCH v2 1/4] accel/tcg: use units.h for defining code gen buffer sizes Alex Bennée
2020-02-28 19:24 ` Alex Bennée [this message]
2020-02-28 20:17   ` [PATCH v2 2/4] accel/tcg: remove link between guest ram and TCG cache size Niek Linnenbank
2020-02-28 19:24 ` [PATCH v2 3/4] accel/tcg: only USE_STATIC_CODE_GEN_BUFFER on 32 bit hosts Alex Bennée
2020-02-28 19:24 ` [PATCH v2 4/4] accel/tcg: increase default code gen buffer size for 64 bit Alex Bennée
2020-02-28 20:18   ` Niek Linnenbank
2020-02-29  1:46 ` [PATCH v2 0/4] Clean-up codegen cache size Richard Henderson

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