sdk/fidl/fuchsia.memory.attribution/pager.fidl

// Copyright 2025 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.memory.attribution;

using zx;

/// Rights to map a VMO in read-only mode and read its "content size" property.
const VMO_MAP_READONLY_RIGHTS zx.Rights
        = zx.RIGHTS_BASIC | zx.Rights.READ | zx.Rights.GET_PROPERTY | zx.Rights.MAP;

/// Protocol used by user pagers to publish memory attribution statistics.
@discoverable
protocol PageRefaultSink {
    /// Sends a VMO containing a shared count of the number of page refaults of a pager. The shared
    /// count is a single atomic 64-bit unsigned integer.
    SendPageRefaultCount(resource struct {
        page_refaults_vmo zx.Handle:<VMO, VMO_MAP_READONLY_RIGHTS>;
    });
};