Use the same SWServer for all ephemeral sessions

[Chris Dumez]

Use the same SWServer for all ephemeral sessions. SWServers never go away and we create one per sessionID. When browsing doing private browsing in Safari (and other fetching favorite icons), the sessionID is ephemeral and keeps changing. This means that we kept constructing new SWServers that would never go away. Each SWServer has a thread so we would eventually hit the thread limit for the storage process.

[Chris Dumez]

<rdar://problem/36873075>

[Chris Dumez]

Created attachment 336319 [details]
Patch

[Brady Eidson]

Comment on attachment 336319 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=336319&action=review

Not going to r-, but I do have one nit

> Source/WebKit/StorageProcess/StorageProcess.cpp:438
> +    // Use the same SWServer for all ephemeral sessions.
> +    if (sessionID.isEphemeral())
> +        sessionID = PAL::SessionID::legacyPrivateSessionID();

We eventually want legacyPrivateSessionID() to go away.

So it would be nicer if we had some sort of shared "global ephemeral SWServer session ID"

But we can also do that later when we get rid of the legacy one.

[WebKit Commit Bot]

Comment on attachment 336319 [details]
Patch

Clearing flags on attachment: 336319

Committed r229872: <https://trac.webkit.org/changeset/229872>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.