Add ucomp rebuild and benchmark script

ucomp_bench.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Recompile ucomp
+make -C /workspace/ucomp clean && make -C /workspace/ucomp
+
+# Stop all current ucomp compressors and unload module (ignore errors)
+ucomp unregister zstd 2>/dev/null || true
+ucomp unregister lzo 2>/dev/null || true
+pkill -f ucomp || true
+rmmod ucomp 2>/dev/null || true
+
+# Insert ucomp module
+insmod /workspace/ucomp/ucomp.ko
+
+# Start ucompd and register compressors
+ucompd register
+
+# Run benchmark for ucomp-zstd (insmod may report 'busy' if already loaded)
+insmod ./comp_bench.ko alg=ucomp-zstd path=/workspace/linux_compile/vmlinux || true
+
+# Run benchmark for ucomp-lzo (insmod may report 'busy' if already loaded)
+insmod ./comp_bench.ko alg=ucomp-lzo path=/workspace/linux_compile/vmlinux || true

ucomp_cmd.c

@@ -0,0 +1,53 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#define UCOMP_CTRL_PATH "/dev/ucomp_ctrl"
+#define UCOMP_IOC_MAGIC 'u'
+#define UCOMP_IOC_REGISTER _IOW(UCOMP_IOC_MAGIC, 1, char *)
+#define UCOMP_IOC_UNREGISTER _IOW(UCOMP_IOC_MAGIC, 2, char *)
+
+static void usage(const char *prog)
+{
+    fprintf(stderr, "Usage: %s <register|unregister> <algorithm>\n", prog);
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc != 3) {
+        usage(argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    const char *cmd = argv[1];
+    const char *alg = argv[2];
+    int fd = open(UCOMP_CTRL_PATH, O_RDWR);
+    if (fd < 0) {
+        perror("open");
+        return EXIT_FAILURE;
+    }
+
+    int ret;
+    if (strcmp(cmd, "register") == 0) {
+        ret = ioctl(fd, UCOMP_IOC_REGISTER, alg);
+    } else if (strcmp(cmd, "unregister") == 0) {
+        ret = ioctl(fd, UCOMP_IOC_UNREGISTER, alg);
+    } else {
+        usage(argv[0]);
+        close(fd);
+        return EXIT_FAILURE;
+    }
+
+    if (ret < 0) {
+        perror(cmd);
+        close(fd);
+        return EXIT_FAILURE;
+    }
+
+    close(fd);
+    return EXIT_SUCCESS;
+}