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This class used to create QUIC streams, but now creates and pools QUIC sessions instead. This rename brings it in line with SpdySessionPool and its `RequestSession` method. This CL has no functional impact. It is a mechanistic rename, performed with `sed`. It avoids renaming existing metrics, preferring continuity of data over accuracy of the name. ``` sed -i 's/quic_stream_factory/quic_session_pool/g;s/QUIC_STREAM_FACTORY/QUIC_SESSION_POOL/g;s/QuicStreamFactory/QuicSessionPool/g' $(git grep -il 'quic.\?stream.\?factory') sed -i 's/quic_stream_request/quic_session_request/g;s/QUIC_STREAM_REQUEST/QUIC_SESSION_REQUEST/g;s/QuicStreamRequest/QuicSessionRequest/g' $(git grep -il 'quic.\?stream.\?request') for f in net/quic/*quic_stream_factory*; do n=$(echo $f | sed -e s/stream/session/g); git mv $f $n; done sed -i 's/Net\.QuicSessionPool/Net.QuicStreamFactory/g' $(git grep -il 'Net.QuicSession' net/ tools/) git cl format ``` Change-Id: I20ceb3d8a0a97cd9c8888bb7414b983b9fe5fa51 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5190439 Reviewed-by: Ryan Hamilton <rch@chromium.org> Commit-Queue: Dustin Mitchell <djmitche@chromium.org> Reviewed-by: Elly FJ <ellyjones@chromium.org> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com> Reviewed-by: Paul Semel <paulsemel@chromium.org> Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org> Reviewed-by: Matt Menke <mmenke@chromium.org> Reviewed-by: David Schinazi <dschinazi@chromium.org> Cr-Commit-Position: refs/heads/main@{#1248827}
80 lines
2.8 KiB
Markdown
80 lines
2.8 KiB
Markdown
# Network Stack Memory Tracing
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This is an overview of the Net column in [MemoryInfra][memory-infra].
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[TOC]
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## Quick Start
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To get an overview of total network stack memory usage, select the Browser
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process' *net* category and look at *effective_size* or *size* column.
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![net stack column][net-stack-column]
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[memory-infra]: README.md
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[net-stack-column]: https://storage.googleapis.com/chromium-docs.appspot.com/net_category.png
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## Detailed Information
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The numbers are reported by the network stack’s MemoryDumpProvider, which is
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implemented by URLRequestContext class. URLRequestContext calls into major
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network stack objects (such as HttpNetworkSession, SSLClientSessionCache,
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HttpCache) to aggregate memory usage numbers. The total number reported in
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“net” is a lower bound of the memory used by the network stack. It is not
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intended to be an accurate measurement. Please use
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[heap profiler][heap-profiler] instead to see all allocations.
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**URLRequestContext** (“url_request_context”)
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This is a top-level network stack object used to create url requests. There are
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several URLRequestContexts in Chrome. See
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[Anatomy of the Network Stack][anatomy-of-network-stack] for what these
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URLRequestContexts are created for. The number of URLRequestContexts increases
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with the number of profiles.
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For a “url_request_context” row, the “object_count” column indicates the number
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of live URLRequests created by that context.
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+ Sub rows
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- HttpCache (“http_cache”)
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This cache can be a disk cache (backed by either block file or simple
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cache backend) or an in-memory cache. An incognito profile, for example,
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has an in-memory HttpCache. You can tell this by whether
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*mem_backend_size* column is present for that particular
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URLRequestContext.
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**HttpNetworkSession** (“http_network_session”)
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This network stack object owns socket pools, the HTTP/2 and QUIC session pools.
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There is usually a 1:1 correspondence from a URLRequestContext to an
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HttpNetworkSession, but there are exceptions. For example, the “main”
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URLRequestContext shares the same HttpNetworkSession with “main_media”
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URLRequestContext and “main_isolated_media” URLRequestContext.
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+ Sub rows
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- HttpStreamFactory(“stream_factory”)
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This object is an entry to establish HTTP/1.1, HTTP/2 and QUIC
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connections.
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- SpdySessionPool (“spdy_session_pool”)
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This object owns HTTP/2 sessions.
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- QuicSessionPool (“quic_session_pool”)
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This object owns QUIC sessions and streams.
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**SSLClientSessionCache** (“ssl_session_cache”)
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This is a global singleton that caches SSL session objects which retain
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references to refcounted SSL Certificates.
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[heap-profiler]: /docs/memory-infra/heap_profiler.md
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[anatomy-of-network-stack]: /net/docs/life-of-a-url-request.md
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