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util: add cacheinfo

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Add helpers to gather cache info from the host at init-time.

For now, only export the host's I/D cache line sizes, which we
will use to improve cache locality to avoid false sharing.

Suggested-by: Richard Henderson <rth@twiddle.net>
Suggested-by: Geert Martin Ijewski <gm.ijewski@web.de>
Tested-by:    Geert Martin Ijewski <gm.ijewski@web.de>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1496794624-4083-1-git-send-email-cota@braap.org>
[rth: Move all implementations from tcg/ppc/]
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota
2017-06-06 20:17:04 -04:00
committed by Richard Henderson
parent cef8fd6836
commit b255b2c8a5
4 changed files with 191 additions and 69 deletions
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3
include/qemu/osdep.h
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@ -483,4 +483,7 @@ char *qemu_get_pid_name(pid_t pid);
*/
pid_t qemu_fork(Error **errp);
extern int qemu_icache_linesize;
extern int qemu_dcache_linesize;
#endif