[WK2] Add more detailed diagnostic logging for measuring network cache efficacy

[Chris Dumez]

Add more detailed diagnostic logging for measuring network cache efficacy.

We want to know the reason the network cache is being by-passed, why the network cache decided not to cache a response and why it cannot reuse a cache entry.

Radar: <rdar://problem/19632080>

[Chris Dumez]

Created attachment 246907 [details]
Patch

[Antti Koivisto]

Comment on attachment 246907 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=246907&action=review

> Source/WebKit2/NetworkProcess/cache/NetworkCache.cpp:202
> +static bool canRetrieve(const WebCore::ResourceRequest& request, CacheBypassReason& reason)

Having both the bool return and the reason seems redundant. Why not just make this return a singe RetrieveDecision enum (or similar) that covers both the success and the failure cases?

Same comment for canStore.

[Antti Koivisto]

Comment on attachment 246907 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=246907&action=review

> Source/WebKit2/NetworkProcess/cache/NetworkCacheStatistics.h:63
> +enum class CacheBypassReason {
> +    None,
> +    NotHTTPFamily,
> +    UnsupportedHTTPMethod,
> +    IsConditionalRequest,
> +    IsReloadIgnoringCacheData
> +};
> +
> +enum class CacheStorageFailure {
> +    None,
> +    NotHTTPFamily,
> +    UnsupportedHTTPMethod,
> +    IsAttachment,
> +    CacheControlNoStore,
> +    UncacheableHTTPStatusCode
> +};
> +
> +enum class CachedEntryReuseFailure {
> +    None,
> +    VaryingHeaderMismatch,
> +    MissingValidatorFields,
> +    Other,
> +};

I think these should then move to NetworkCache scope.

[Chris Dumez]

Created attachment 246993 [details]
Patch

[Antti Koivisto]

Comment on attachment 246993 [details]
Patch

r=me

[WebKit Commit Bot]

Comment on attachment 246993 [details]
Patch

Clearing flags on attachment: 246993

Committed r180456: <http://trac.webkit.org/changeset/180456>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.