feat(zram): 优化压缩算法检测逻辑并增加自动回退机制

1.sh

@@ -300,7 +300,7 @@ install_zram() {
     return 0
   fi
 
-  local total_mem algo percent
+  local total_mem algo percent available_algorithms
   total_mem=$(awk '/MemTotal/{print int($2 / 1024)}' /proc/meminfo)
 
   if ! [[ "$total_mem" =~ ^[0-9]+$ ]] || [ "$total_mem" -le 0 ]; then
@@ -308,22 +308,48 @@ install_zram() {
     return 0
   fi
 
+  available_algorithms=$(tr ' ' '\n' </sys/block/zram0/comp_algorithm 2>/dev/null | tr -d '[]' || true)
+  echo "检测到支持的 zram 算法: ${available_algorithms:-unknown}"
+
+  choose_zram_algorithm() {
+    local candidate
+    for candidate in "$@"; do
+      if printf '%s\n' "$available_algorithms" | grep -qx "$candidate"; then
+        printf '%s\n' "$candidate"
+        return 0
+      fi
+    done
+    return 1
+  }
+
   echo "检测到总内存: ${total_mem}MB"
 
   if [ "$total_mem" -le 2500 ]; then
     percent="100"
 
-    if [ -r /sys/block/zram0/comp_algorithm ] && grep -qw zstd /sys/block/zram0/comp_algorithm; then
-      algo="zstd"
+    if algo=$(choose_zram_algorithm zstd lz4 lzo-rle lzo); then
+      if [ "$algo" = "zstd" ]; then
         echo "策略：内存 <= 2G，使用 zstd 算法 (100% 占比)"
       else
-      algo="lz4"
-      echo "策略：内存 <= 2G，但内核未报告 zstd 支持，回退到 lz4 (100% 占比)"
+        echo "策略：内存 <= 2G，但内核未报告 zstd 支持，回退到 $algo (100% 占比)"
+      fi
+    else
+      print_yellow "未检测到受支持的 zram 压缩算法，跳过 zram 配置"
+      return 0
     fi
   else
-    algo="lz4"
     percent="60"
+
+    if algo=$(choose_zram_algorithm lz4 zstd lzo-rle lzo); then
+      if [ "$algo" = "lz4" ]; then
         echo "策略：内存 > 2G，使用 lz4 算法 (60% 占比)"
+      else
+        echo "策略：内存 > 2G，但内核未报告 lz4 支持，回退到 $algo (60% 占比)"
+      fi
+    else
+      print_yellow "未检测到受支持的 zram 压缩算法，跳过 zram 配置"
+      return 0
+    fi
   fi
 
   cat <<EOF >/etc/default/zramswap
@@ -333,7 +359,12 @@ PERCENT=$percent
 PRIORITY=100
 EOF
 
-  systemctl restart zramswap
+  if ! systemctl restart zramswap; then
+    print_red "zramswap 服务重启失败"
+    systemctl status zramswap.service --no-pager || true
+    journalctl -u zramswap.service -n 20 --no-pager || true
+    return 1
+  fi
 
   echo "---------------------------------------"
   echo "zram 部署完成！当前状态："