docs: add buildkitd.toml docs new gc options

docs/buildkitd.toml.md

@@ -62,11 +62,25 @@ insecure-entitlements = [ "network.host", "security.insecure" ]
   # Whether run subprocesses in main pid namespace or not, this is useful for
   # running rootless buildkit inside a container.
   noProcessSandbox = false
+
+  # gc enables/disables garbage collection
   gc = true
-  # gckeepstorage can be an integer number of bytes (e.g. 512000000), a string
-  # with a unit (e.g. "512MB"), or a string percentage of the total disk
-  # space (e.g. "10%")
-  gckeepstorage = 9000
+  # reservedSpace is the minimum amount of disk space guaranteed to be
+  # retained by this buildkit worker - any usage below this threshold will not
+  # be reclaimed during garbage collection.
+  # all disk space parameters can be an integer number of bytes (e.g.
+  # 512000000), a string with a unit (e.g. "512MB"), or a string percentage
+  # of the total disk space (e.g. "10%")
+  reservedSpace = "30%"
+  # maxUsedSpace is the maximum amount of disk space that may be used by
+  # this buildkit worker - any usage above this threshold will be reclaimed
+  # during garbage collection.
+  maxUsedSpace = "60%"
+  # minFreeSpace is the target amount of free disk space that the garbage
+  # collector will attempt to leave - however, it will never be bought below
+  # reservedSpace.
+  minFreeSpace = "20GB"
+
   # alternate OCI worker binary name(example 'crun'), by default either 
   # buildkit-runc or runc binary is used
   binary = ""
@@ -83,26 +97,51 @@ insecure-entitlements = [ "network.host", "security.insecure" ]
     "foo" = "bar"
 
   [[worker.oci.gcpolicy]]
-    # keepBytes can be an integer number of bytes (e.g. 512000000), a string
-    # with a unit (e.g. "512MB"), or a string percentage of the total disk
-    # space (e.g. "10%")
-    keepBytes = "512MB"
+    # reservedSpace is the minimum amount of disk space guaranteed to be
+    # retained by this policy - any usage below this threshold will not be
+    # reclaimed during # garbage collection.
+    reservedSpace = "512MB"
+    # maxUsedSpace is the maximum amount of disk space that may be used by this
+    # policy - any usage above this threshold will be reclaimed during garbage
+    # collection.
+    maxUsedSpace = "1GB"
+    # minFreeSpace is the target amount of free disk space that the garbage
+    # collector will attempt to leave - however, it will never be bought below
+    # reservedSpace.
+    minFreeSpace = "10GB"
+
     # keepDuration can be an integer number of seconds (e.g. 172800), or a
     # string duration (e.g. "48h")
     keepDuration = "48h"
     filters = [ "type==source.local", "type==exec.cachemount", "type==source.git.checkout"]
   [[worker.oci.gcpolicy]]
     all = true
-    keepBytes = 1024000000
+    reservedSpace = 1024000000
 
 [worker.containerd]
   address = "/run/containerd/containerd.sock"
   enabled = true
   platforms = [ "linux/amd64", "linux/arm64" ]
   namespace = "buildkit"
+
+  # gc enables/disables garbage collection
   gc = true
-  # gckeepstorage sets storage limit for default gc profile, in bytes.
-  gckeepstorage = 9000
+  # reservedSpace is the minimum amount of disk space guaranteed to be
+  # retained by this buildkit worker - any usage below this threshold will not
+  # be reclaimed during garbage collection.
+  # all disk space parameters can be an integer number of bytes (e.g.
+  # 512000000), a string with a unit (e.g. "512MB"), or a string percentage
+  # of the total disk space (e.g. "10%")
+  reservedSpace = "30%"
+  # maxUsedSpace is the maximum amount of disk space that may be used by
+  # this buildkit worker - any usage above this threshold will be reclaimed
+  # during garbage collection.
+  maxUsedSpace = "60%"
+  # minFreeSpace is the target amount of free disk space that the garbage
+  # collector will attempt to leave - however, it will never be bought below
+  # reservedSpace.
+  minFreeSpace = "20GB"
+
   # maintain a pool of reusable CNI network namespaces to amortize the overhead
   # of allocating and releasing the namespaces
   cniPoolSize = 16
@@ -119,12 +158,12 @@ insecure-entitlements = [ "network.host", "security.insecure" ]
     options = { BinaryName = "runc" }
 
   [[worker.containerd.gcpolicy]]
-    keepBytes = 512000000
+    reservedSpace = 512000000
     keepDuration = 172800
     filters = [ "type==source.local", "type==exec.cachemount", "type==source.git.checkout"]
   [[worker.containerd.gcpolicy]]
     all = true
-    keepBytes = 1024000000
+    reservedSpace = 1024000000
 
 # registry configures a new Docker register used for cache import or output.
 [registry."docker.io"]