We have some oddities in our jemalloc stats reporting.
- "heap-overhead-ratio" is a strange measurement: overhead / non-overhead,
expressed as a percentage. And it omits "bin_unused", which appears to be an
oversight.
- "heap-committed" also omits "bin_unused".
- There are some minor errors in memory report descriptions.
This patch fixes these and improves the heap reporting. It makes the following
reporting changes:
- "heap-allocated": Duplicated as "heap-committed/allocated". (We keep
"heap-allocated" because that's a special value used in the computation of
"heap-unclassified".)
- "heap-committed/overhead": Added; it's the same as the sum of the
"explicit/heap-overhead/*" values. Together with "heap-committed/allocated"
it shows clearly what fraction of the heap is overhead and what fraction is
useful.
- "heap-committed": Removed; now implicit as the "heap-committed/" node.
- "heap-overhead-ratio":
- Removed from memory reports; now shown as the percentage of the new
"heap-committed/overhead" node.
- Still available as a distinguished amount (because it's useful in
isolation) but renamed to heapOverheadFraction, and the telemetry ID is
renamed as MEMORY_HEAP_OVERHEAD_FRACTION.
- "heap-chunks": Removed; it's not that interesting, and can be manually
computed as "heap-mapped" / "heap-chunksize" if necessary.
--HG--
extra : rebase_source : 6f238cda780eb17b2de2f8b9a0b04377c93b109c
Part 1: Refactored LoadLibrarySystem32 to expose the system32-path
construction code, so it can be re-used in the following patch.
MozReview-Commit-ID: J5BcI34VPnN
GetSerialNumber accesses global state through gSerialNumbers. We call
GetSerialNumber under a lock when doing normal object refcount logging.
However, we call GetSerialNumber outside of a lock when we're tracing
individual classes for nsCOMPtr refcount logging, even if we don't
actually care about nsCOMPtr refcount logging. We should call it under
a lock always.
UniquePtr is more standard than ScopedFreePtr; using standard constructs
whenever possible is preferable. In this particular case, since we
really just need a chunk of memory, we can allocate a char[] via
MakeUnique.
XPTInterfaceDescriptor::num_additional_types can easily fit in 8 bits -- in
practice it doesn't exceed 20, and there's already a check in DoTypeDescriptor
that it doesn't exceed 255. This patch shrinks it and moves that check into
XPT_InterfaceDescriptorAddTypes() so that any overflow would be detected more
reliably.
On 64-bit platforms this reduces sizeof(XPTInterfaceDescriptor) from 40 to 32
and correspondingly reduces "xpti-working-set" by 16 KiB.
The patch also changes XPT_InterfaceDescriptorAddTypes() into a local function,
because it's defined and only used in xpt_struct.cpp.
--HG--
extra : rebase_source : 754a343bd52c3db35b21a4055a94c7235a70a7a2
This patch:
- Removes XPTArena's ability to support arbitrary alignments.
- Hardwires two sub-arenas into XPTArena, one with alignment of 8 and one with
alignment of 1.
- Uses the first sub-arena for most allocations and the second sub-arena for C
string allocations.
These changes reduce "xpti-working-set" by 56 KiB.
The patch also renames all the used of "malloc" in XPT identifiers with
"calloc", to make clearer that the result is always zeroed.
--HG--
extra : rebase_source : 8e6cc42644621a7f3c80593006734e25420c7229
With careful layout we can reduce sizeof(XPTTypeDescriptor) from 4 to 3, which
also reduces sizeof(XPTParamDescriptor) from 6 to 4. This reduces
"xpti-working-set" by 16 KiB.
The union-of-structs also improves readability by making it clearer exactly
which fields are used for which types.
--HG--
extra : rebase_source : 08060096f93c756fda847b90b45df1b1b207e2b5
This requires merging XPT_DoHeaderPrologue() and XPT_DoHeader(), which is
straightforward.
This reduces "xpti-working-set" by 16 KiB on 64-bit platforms.
--HG--
extra : rebase_source : 74510d6aefe8adc20064bee2c729d7a55fe4b58a
Removing it reduces the "xpti-working-set" measurement by 16 KiB (measured on
64-bit).
--HG--
extra : rebase_source : e6d3911f96ee498a8990b702bb8fa499e55ececb
XPTTypeDescriptor::argnum2 is unused. Removing it reduces
sizeof(XPTTypeDescriptor) from 6 bytes to 4 bytes, which reduces the
"xpti-working-set" measurement by 80 KiB (measured on 64-bit).
--HG--
extra : rebase_source : e89f83df810d0466b724d8307fb567e2a93a3809
Even though the .xpt files we produce never have annotations, .xpt files in the
wild might have them. This partly undoes part 3 of bug 1248534.
--HG--
extra : rebase_source : c0ff4e5ea7afc66f83b1314ee1d7fe0594f9b644
XPT has some functions and macros for freeing memory. However, they (a) are
only used on error paths, and (b) don't actually free memory -- they just
optionally log the "freeing" -- because piecewise freeing doesn't make sense
with arena allocation.
This patch removes all that unnecessary machinery.
--HG--
extra : rebase_source : 40fb8dfd3851a89aaf0501ae290b3a6ca8ac90bc
RegisterBuffer() is the only place that creates an XPTState, and it also
destroys it. So the XPTState can be allocated on the stack, which voids the
need for the creation of an XPTArena.
--HG--
extra : rebase_source : b25f0e798d72b8742efc96793a927f8a060101cf
XPT supports annotations but xpt.py doesn't generate them except for a single
empty annotation (to indicate there are no real annotations). So we can remove
almost all support for them. This also allows XPTString to be removed.
--HG--
extra : rebase_source : 889e635e9167f31c38c015bafe943f2c577f1daf
Currently XPT can both encode and decode, but encoding has been handled by
Python code since bug 643817, so the encoding support can be removed. This
results in many simplifications. Some notable changes:
- All the XPTHashTable code (including XPTDatapool::offset_map) is no longer
necessary.
- PrimitiveTest.cpp and SimpleTypeLib.cpp both don't make much sense without
encoding support, so I removed them.
- A lot of the version code was already unused, e.g. XPT_VERSION_*,
XPT_TYPELIB_VERSIONS_STRUCT, XPT_TYPELIB_VERSIONS.
XPT_MAJOR_INCOMPATIBLE_VERSION is the only thing actually used in version
checks.
- The patch also removes some code that was dead even before encoding removal,
such as XPT_ParseVersionString().
--HG--
extra : rebase_source : 11cfe0b01efde4e2ff0c74b02b408baebedd3dd8
