Decouple filemem from platform and move it to pgalloc.MemoryFile.

This is in preparation for improved page cache reclaim, which requires
greater integration between the page cache and page allocator.

PiperOrigin-RevId: 238444706
Change-Id: Id24141b3678d96c7d7dc24baddd9be555bffafe4

1 files changed, 57 insertions, 0 deletions

diff --git a/pkg/sentry/pgalloc/BUILD b/pkg/sentry/pgalloc/BUILD
new file mode 100644
index 000000000..7efa55c20
--- /dev/null
+++ b/pkg/sentry/pgalloc/BUILD
@@ -0,0 +1,57 @@
+package(licenses = ["notice"])
+
+load("//tools/go_generics:defs.bzl", "go_template_instance")
+load("//tools/go_stateify:defs.bzl", "go_library", "go_test")
+
+go_template_instance(
+    name = "usage_set",
+    out = "usage_set.go",
+    consts = {
+        "minDegree": "10",
+    },
+    imports = {
+        "platform": "gvisor.googlesource.com/gvisor/pkg/sentry/platform",
+    },
+    package = "pgalloc",
+    prefix = "usage",
+    template = "//pkg/segment:generic_set",
+    types = {
+        "Key": "uint64",
+        "Range": "platform.FileRange",
+        "Value": "usageInfo",
+        "Functions": "usageSetFunctions",
+    },
+)
+
+go_library(
+    name = "pgalloc",
+    srcs = [
+        "context.go",
+        "pgalloc.go",
+        "pgalloc_unsafe.go",
+        "save_restore.go",
+        "usage_set.go",
+    ],
+    importpath = "gvisor.googlesource.com/gvisor/pkg/sentry/pgalloc",
+    visibility = ["//pkg/sentry:internal"],
+    deps = [
+        "//pkg/log",
+        "//pkg/sentry/arch",
+        "//pkg/sentry/context",
+        "//pkg/sentry/memutil",
+        "//pkg/sentry/platform",
+        "//pkg/sentry/safemem",
+        "//pkg/sentry/usage",
+        "//pkg/sentry/usermem",
+        "//pkg/state",
+        "//pkg/syserror",
+    ],
+)
+
+go_test(
+    name = "pgalloc_test",
+    size = "small",
+    srcs = ["pgalloc_test.go"],
+    embed = [":pgalloc"],
+    deps = ["//pkg/sentry/usermem"],
+)