[Webkit-unassigned] [Bug 209186] New: [GTK][WPE] Check the cgroups memory limits (v1 and v2) to calculate the systemMemoryUsedAsPercentage() in the MemoryPressureMonitor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209186

            Bug ID: 209186
           Summary: [GTK][WPE] Check the cgroups memory limits (v1 and v2)
                    to calculate the systemMemoryUsedAsPercentage() in the
                    MemoryPressureMonitor
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: psaavedra at igalia.com
                CC: bugs-noreply at webkitgtk.org

The support to check the merory pressure level using with cgroups was dropped in 184261 [1]:

   [GTK][WPE] Memory pressure monitor doesn't reliable notify all the subprocesses

[1] https://bugs.webkit.org/show_bug.cgi?id=184261


This patch adds some additional logic in the MemoryPressureMonitor::systemMemoryUsedAsPercentage() to check the cgroups memory limits if the system  has available the cgroups mountpoint (`/sys/fs/cgroup/memory/`).

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