On Thu, Sep 13, 2012 at 6:16 PM, Adam Barth <aba...@webkit.org> wrote:
> On Thu, Sep 13, 2012 at 5:13 PM, Adam Barth <aba...@webkit.org> wrote: > > Another metric we have is for Blob.webkitSlice: > > > > Ratio of Blob.webkitSlice calls to Blob.slice: 14.87% > > Ratio of Blob.webkitSlice calls to Document creation: 0.0053% > > > > It's difficult to know how to interpret this data because we don't > > actually correlate calls to webkitSlice with Documents or Pages. > > Instead, we just count the total number of calls across all Documents. > > This gives us an upper bound on how many Documents (or Pages) would > > be affected by deleting Blob.webkitSlice, but doesn't measure that > > information as accurately as the data we have for mutation events. > > Based on this data, I've posted a patch for removing Blob.webkitSlice > in favor of Blob.slice: > > https://bugs.webkit.org/show_bug.cgi?id=96715 > > Adam So, worst case 53 out of a million pages calls webkitSlice. But, it is easy to imagine that that upper bound is crazy high, and more likely a couple pages simply call webkitSlice a lot. Also, given that there are so many more calls to Blob.slice() one could imagine that sites that call webkitSlice probably have fallback to Blob.slice(). Is this the hypothesis? -Darin
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