[Webkit-unassigned] [Bug 171944] New: [iOS] Use memory footprint to dynamically adjust behavior of allocators

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171944

            Bug ID: 171944
           Summary: [iOS] Use memory footprint to dynamically adjust
                    behavior of allocators
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

On iOS, there is a soft memory limit of 840MB for WebContent processes.  When we get close to or above that limit and don’t reduce memory usage it is likely the OS will jetsam the process.  The OS provides memory pressure notifications, but that mechanism is course and may not provide a timely way to modify behavior.

It makes more sense to modify our allocation policies and return free memory back to the OS more agressively as we approach our memory limit.

<rdar://problem/32116376>

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