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[Qemu-devel] [RFC 48/48] plugin: add a couple of very simple examples
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [RFC 48/48] plugin: add a couple of very simple examples |
Date: |
Thu, 25 Oct 2018 13:20:57 -0400 |
Signed-off-by: Emilio G. Cota <address@hidden>
---
plugin-examples/bbcount_avgsize_racy.c | 50 ++++++++++++++++++++++
plugin-examples/mem_count_racy_both.c | 58 ++++++++++++++++++++++++++
plugin-examples/Makefile | 31 ++++++++++++++
3 files changed, 139 insertions(+)
create mode 100644 plugin-examples/bbcount_avgsize_racy.c
create mode 100644 plugin-examples/mem_count_racy_both.c
create mode 100644 plugin-examples/Makefile
diff --git a/plugin-examples/bbcount_avgsize_racy.c
b/plugin-examples/bbcount_avgsize_racy.c
new file mode 100644
index 0000000000..ccdf96c1fa
--- /dev/null
+++ b/plugin-examples/bbcount_avgsize_racy.c
@@ -0,0 +1,50 @@
+#include <inttypes.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include <qemu-plugin.h>
+
+static uint64_t bb_count;
+static uint64_t insn_count;
+const char *filename;
+static int stdout_fd;
+
+static void plugin_exit(qemu_plugin_id_t id, void *p)
+{
+ dprintf(stdout_fd, "insns: %" PRIu64", bb: %" PRIu64 ", "
+ "avg insns/bb: %.2f\n",
+ insn_count, bb_count, (double)insn_count / bb_count);
+}
+
+static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
+{
+ unsigned long n_insns = (unsigned long)udata;
+
+ insn_count += n_insns;
+ bb_count++;
+}
+
+static void vcpu_tb_trans(qemu_plugin_id_t id, unsigned int cpu_index,
+ struct qemu_plugin_tb *tb)
+{
+ unsigned long n_insns = qemu_plugin_tb_n_insns(tb);
+
+ qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
+ QEMU_PLUGIN_CB_NO_REGS,
+ (void *)n_insns);
+}
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, int argc,
+ char **argv)
+{
+ /* plugin_exit might write to stdout after stdout has been closed */
+ stdout_fd = dup(STDOUT_FILENO);
+ assert(stdout_fd);
+
+ qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
+ qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
+ return 0;
+}
diff --git a/plugin-examples/mem_count_racy_both.c
b/plugin-examples/mem_count_racy_both.c
new file mode 100644
index 0000000000..a47f2025bf
--- /dev/null
+++ b/plugin-examples/mem_count_racy_both.c
@@ -0,0 +1,58 @@
+#include <inttypes.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include <qemu-plugin.h>
+
+static uint64_t mem_count;
+static int stdout_fd;
+static bool do_inline;
+
+static void plugin_exit(qemu_plugin_id_t id, void *p)
+{
+ dprintf(stdout_fd, "accesses: %" PRIu64 "\n", mem_count);
+}
+
+static void vcpu_mem(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
+ uint64_t vaddr, void *udata)
+{
+ mem_count++;
+}
+
+static void vcpu_tb_trans(qemu_plugin_id_t id, unsigned int cpu_index,
+ struct qemu_plugin_tb *tb)
+{
+ size_t n = qemu_plugin_tb_n_insns(tb);
+ size_t i;
+
+ for (i = 0; i < n; i++) {
+ struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
+
+ if (do_inline) {
+ qemu_plugin_register_vcpu_mem_inline(insn,
+ QEMU_PLUGIN_INLINE_ADD_U64,
+ &mem_count, 1);
+ } else {
+ qemu_plugin_register_vcpu_mem_cb(insn, vcpu_mem,
+ QEMU_PLUGIN_CB_NO_REGS, NULL);
+ }
+ }
+}
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, int argc,
+ char **argv)
+{
+ if (argc && strcmp(argv[0], "inline") == 0) {
+ do_inline = true;
+ }
+ /* plugin_exit might write to stdout after stdout has been closed */
+ stdout_fd = dup(STDOUT_FILENO);
+ assert(stdout_fd);
+
+ qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
+ qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
+ return 0;
+}
diff --git a/plugin-examples/Makefile b/plugin-examples/Makefile
new file mode 100644
index 0000000000..71bbcda7a8
--- /dev/null
+++ b/plugin-examples/Makefile
@@ -0,0 +1,31 @@
+NAMES :=
+NAMES += bbcount_avgsize_racy
+NAMES += mem_count_racy_both
+
+SONAMES := $(addsuffix .so,$(addprefix lib,$(NAMES)))
+
+# QEMU installed path, set by --prefix during configure
+QEMU_PATH ?= /data/src/qemu-inst/plugin-test
+
+CC := gcc
+CFLAGS :=
+CFLAGS += -O2 -Werror -Wall
+CFLAGS += -Wundef -Wwrite-strings -Wmissing-prototypes
+CFLAGS += -Wstrict-prototypes -Wredundant-decls
+CFLAGS += -fno-strict-aliasing -fno-common -fwrapv
+CFLAGS += -I$(QEMU_PATH)/include
+LDLIBS := -lc
+
+all: $(SONAMES)
+
+%.o: %.c
+ $(CC) $(CFLAGS) -fPIC -c $< -o $@
+
+lib%.so: %.o
+ $(CC) -shared -Wl,-soname,$@ -o $@ $^ $(LDLIBS)
+
+clean:
+ $(RM) -f *.o *.so
+ $(RM) -Rf .libs
+
+.PHONY: all clean
--
2.17.1
- [Qemu-devel] [RFC 28/48] target/i386: prepare for 2-pass translation, (continued)
- [Qemu-devel] [RFC 28/48] target/i386: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 23/48] translator: add plugin_insn argument to translate_insn, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 39/48] plugin: add API symbols to qemu-plugins.symbols, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 18/48] tcg: add memory callbacks for plugins (WIP), Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 10/48] exec: export do_tb_flush, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 19/48] translate-all: notify plugin code of tb_flush, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 09/48] tcg: reset runtime helpers when flushing the code cache, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 01/48] cpu: introduce run_on_cpu_no_bql, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 20/48] *-user: notify plugin of exit, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 13/48] xxhash: add qemu_xxhash8, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 48/48] plugin: add a couple of very simple examples,
Emilio G. Cota <=
- [Qemu-devel] [RFC 12/48] atomic_template: define pre/post macros, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 07/48] tcg: export TCGHelperInfo, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 08/48] tcg: export tcg_gen_runtime_helper, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 04/48] exec: introduce qemu_xxhash{2,4,5,6,7}, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 31/48] target/mips: prepare for 2-pass translation (WIP), Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 34/48] target/s390x: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 32/48] target/alpha: prepare for 2-pass translation, Emilio G. Cota, 2018/10/25
- [Qemu-devel] [RFC 40/48] plugin: let plugins control the virtual clock, Emilio G. Cota, 2018/10/25