[Webkit-unassigned] [Bug 212562] New: Consider a Thread Specific Cache for AssemblerBuffers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212562

            Bug ID: 212562
           Summary: Consider a Thread Specific Cache for AssemblerBuffers
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

When JIT compiling, we create AssemblerBuffers to store the generated code before linking and copying to executable memory.  Those buffers start out with a built in capacity of 128 bytes.   Every time we need to grow, we realloc() which is usually a malloc() followed by a copy.  This causes malloc churn, possible cache locality issues and other performance hits.  If we keep a thread local cache, it should allow JIT worker threads to reuse a prior buffer with little or no realloc()'s.

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