From: Richard Henderson <rth@twiddle.net>
To: qemu-devel@nongnu.org
Cc: Blue Swirl <blauwirbel@gmail.com>, Anthony Liguori <aliguori@us.ibm.com>
Subject: [Qemu-devel] [PATCH] exec: Advise huge pages for the TCG code gen buffer
Date: Fri, 2 Nov 2012 09:20:46 +1100 [thread overview]
Message-ID: <1351808446-2436-1-git-send-email-rth@twiddle.net> (raw)
After allocating 32MB or more contiguous memory, huge pages
would seem to be ideal.
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
exec.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/exec.c b/exec.c
index df67938..ab07f68 100644
--- a/exec.c
+++ b/exec.c
@@ -602,6 +602,8 @@ 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
--
1.7.11.7
next reply other threads:[~2012-11-01 22:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-01 22:20 Richard Henderson [this message]
2012-12-08 17:52 ` [Qemu-devel] [PATCH] exec: Advise huge pages for the TCG code gen buffer Blue Swirl
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1351808446-2436-1-git-send-email-rth@twiddle.net \
--to=rth@twiddle.net \
--cc=aliguori@us.ibm.com \
--cc=blauwirbel@gmail.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).