4.4.0

@jasone jasone released this Dec 4, 2016 · 236 commits to dev since this release

New features:

  • Add configure support for --linux-android. (@cferris1000, @jasone)
  • Add the --disable-syscall configure option, for use on systems that place security-motivated limitations on syscall(2). (@jasone)
  • Add support for Debian GNU/kFreeBSD. (@thesam)

Optimizations:

  • Add extent serial numbers and use them where appropriate as a sort key that is higher priority than address, so that the allocation policy prefers older extents. This tends to improve locality (decrease fragmentation) when memory grows downward. (@jasone)
  • Refactor madvise(2) configuration so that MADV_FREE is detected and utilized on Linux 4.5 and newer. (@jasone)
  • Mark partially purged arena chunks as non-huge-page. This improves interaction with Linux's transparent huge page functionality. (@jasone)

Bug fixes:

  • Fix size class computations for edge conditions involving extremely large allocations. This regression was first released in 4.0.0. (@jasone, @ingvarha)
  • Remove overly restrictive assertions related to the cactive statistic. This regression was first released in 4.1.0. (@jasone)
  • Implement a more reliable detection scheme for os_unfair_lock on macOS. (@jszakmeister)

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4.3.1

@jasone jasone released this Nov 8, 2016 · 236 commits to dev since this release

Bug fixes:

  • Fix a severe virtual memory leak. This regression was first released in 4.3.0. (@interwq, @jasone)
  • Refactor atomic and prng APIs to restore support for 32-bit platforms that use pre-C11 toolchains, e.g. FreeBSD's mips. (@jasone)

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4.3.0

@jasone jasone released this Nov 5, 2016 · 236 commits to dev since this release

This is the first release that passes the test suite for multiple Windows configurations, thanks in large part to @glandium setting up continuous integration via AppVeyor (and Travis CI for Linux and OS X).

New features:

  • Add "J" (JSON) support to malloc_stats_print(). (@jasone)
  • Add Cray compiler support. (@ronawho)

Optimizations:

  • Add/use adaptive spinning for bootstrapping and radix tree node initialization. (@jasone)

Bug fixes:

  • Fix large allocation to search starting in the optimal size class heap, which can substantially reduce virtual memory churn and fragmentation. This regression was first released in 4.0.0. (@mjp41, @jasone)
  • Fix stats.arenas.<i>.nthreads accounting. (@interwq)
  • Fix and simplify decay-based purging. (@jasone)
  • Make DSS (sbrk(2)-related) operations lockless, which resolves potential deadlocks during thread exit. (@jasone)
  • Fix over-sized allocation of radix tree leaf nodes. (@mjp41, @ogaun, @jasone)
  • Fix over-sized allocation of arena_t (plus associated stats) data structures. (@jasone, @interwq)
  • Fix EXTRA_CFLAGS to not affect configuration. (@jasone)
  • Fix a Valgrind integration bug. (@ronawho)
  • Disallow 0x5a junk filling when running in Valgrind. (@jasone)
  • Fix a file descriptor leak on Linux. This regression was first released in 4.2.0. (@vsarunas, @jasone)
  • Fix static linking of jemalloc with glibc. (@djwatson)
  • Use syscall(2) rather than {open,read,close}(2) during boot on Linux. This works around other libraries' system call wrappers performing reentrant allocation. (@kspinka, @Whissi, @jasone)
  • Fix OS X default zone replacement to work with OS X 10.12. (@glandium, @jasone)
  • Fix cached memory management to avoid needless commit/decommit operations during purging, which resolves permanent virtual memory map fragmentation issues on Windows. (@mjp41, @jasone)
  • Fix TSD fetches to avoid (recursive) allocation. This is relevant to non-TLS and Windows configurations. (@jasone)
  • Fix malloc_conf overriding to work on Windows. (@jasone)
  • Forcibly disable lazy-lock on Windows (was forcibly enabled). (@jasone)

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4.2.1

@jasone jasone released this Jun 8, 2016 · 236 commits to dev since this release

Bug fixes:

  • Fix bootstrapping issues for configurations that require allocation during tsd initialization (e.g. --disable-tls). (@cferris1000, @jasone)
  • Fix gettimeofday() version of nstime_update(). (@ronawho)
  • Fix Valgrind regressions in calloc() and chunk_alloc_wrapper(). (@ronawho)
  • Fix potential VM map fragmentation regression. (@jasone)
  • Fix opt_zero-triggered in-place huge reallocation zeroing. (@jasone)
  • Fix heap profiling context leaks in reallocation edge cases. (@jasone)

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4.2.0

@jasone jasone released this May 12, 2016 · 236 commits to dev since this release

New features:

  • Add the arena.<i>.reset mallctl, which makes it possible to discard all of an arena's allocations in a single operation. (@jasone)
  • Add the stats.retained and stats.arenas.<i>.retained statistics. (@jasone)
  • Add the --with-version configure option. (@jasone)
  • Support --with-lg-page values larger than actual page size. (@jasone)

Optimizations:

  • Use pairing heaps rather than red-black trees for various hot data structures. (@djwatson, @jasone)
  • Streamline fast paths of rtree operations. (@jasone)
  • Optimize the fast paths of calloc() and [m,d,sd]allocx(). (@jasone)
  • Decommit unused virtual memory if the OS does not overcommit. (@jasone)
  • Specify MAP_NORESERVE on Linux if [heuristic] overcommit is active, in order to avoid unfortunate interactions during fork(2). (@jasone)

Bug fixes:

  • Fix chunk accounting related to triggering gdump profiles. (@jasone)
  • Link against librt for clock_gettime(2) if glibc < 2.17. (@jasone)
  • Scale leak report summary according to sampling probability. (@jasone)

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4.1.1

@jasone jasone released this May 4, 2016 · 319 commits to dev since this release

This bugfix release resolves a variety of mostly minor issues, though the bitmap fix is critical for 64-bit Windows.

Bug fixes:

  • Fix the linear scan version of bitmap_sfu() to shift by the proper amount even when sizeof(long) is not the same as sizeof(void *), as on 64-bit Windows. (@jasone)
  • Fix hashing functions to avoid unaligned memory accesses (and resulting crashes). This is relevant at least to some ARM-based platforms. (@rkmisra)
  • Fix fork()-related lock rank ordering reversals. These reversals were unlikely to cause deadlocks in practice except when heap profiling was enabled and active. (@jasone)
  • Fix various chunk leaks in OOM code paths. (@jasone)
  • Fix malloc_stats_print() to print opt.narenas correctly. (@jasone)
  • Fix MSVC-specific build/test issues. (@rustyx, @yuslepukhin)
  • Fix a variety of test failures that were due to test fragility rather than core bugs. (@jasone)

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4.1.0

@jasone jasone released this Feb 28, 2016 · 334 commits to dev since this release

This release is primarily about optimizations, but it also incorporates a lot of portability-motivated refactoring and enhancements. Many people worked on this release, to an extent that even with the omission here of minor changes (see git revision history), and of the people who reported and diagnosed issues, so much of the work was contributed that starting with this release, changes are annotated with author credits to help reflect the collaborative effort involved.

New features:

  • Implement decay-based unused dirty page purging, a major optimization with mallctl API impact. This is an alternative to the existing ratio-based unused dirty page purging, and is intended to eventually become the sole purging mechanism. New mallctls:

    • opt.purge
    • opt.decay_time
    • arena.<i>.decay
    • arena.<i>.decay_time
    • arenas.decay_time
    • stats.arenas.<i>.decay_time

    (@jasone, @cevans87)

  • Add --with-malloc-conf, which makes it possible to embed a default options string during configuration. This was motivated by the desire to specify --with-malloc-conf=purge:decay , since the default must remain purge:ratio until the 5.0.0 release. (@jasone)

  • Add MS Visual Studio 2015 support. (@rustyx, @yuslepukhin)

  • Make *allocx() size class overflow behavior defined. The maximum size class is now less than PTRDIFF_MAX to protect applications against numerical overflow, and all allocation functions are guaranteed to indicate errors rather than potentially crashing if the request size exceeds the maximum size class. (@jasone)

  • jeprof:

    • Add raw heap profile support. (@jasone)
    • Add --retain and --exclude for backtrace symbol filtering. (@jasone)

Optimizations:

  • Optimize the fast path to combine various bootstrapping and configuration checks and execute more streamlined code in the common case. (@interwq)
  • Use linear scan for small bitmaps (used for small object tracking). In addition to speeding up bitmap operations on 64-bit systems, this reduces allocator metadata overhead by approximately 0.2%. (@djwatson)
  • Separate arena_avail trees, which substantially speeds up run tree operations. (@djwatson)
  • Use memoization (boot-time-computed table) for run quantization. Separate arena_avail trees reduced the importance of this optimization. (@jasone)
  • Attempt mmap-based in-place huge reallocation. This can dramatically speed up incremental huge reallocation. (@jasone)

Incompatible changes:

  • Make opt.narenas unsigned rather than size_t. (@jasone)

Bug fixes:

  • Fix stats.cactive accounting regression. (@rustyx, @jasone)
  • Handle unaligned keys in hash(). This caused problems for some ARM systems. (@jasone, Christopher Ferris)
  • Refactor arenas array. In addition to fixing a fork-related deadlock, this makes arena lookups faster and simpler. (@jasone)
  • Move retained memory allocation out of the default chunk allocation function, to a location that gets executed even if the application installs a custom chunk allocation function. This resolves a virtual memory leak. (@buchgr)
  • Fix a potential tsd cleanup leak. (Christopher Ferris, @jasone)
  • Fix run quantization. In practice this bug had no impact unless applications requested memory with alignment exceeding one page. (@jasone, @djwatson)
  • Fix LinuxThreads-specific bootstrapping deadlock. (Cosmin Paraschiv)
  • jeprof:
    • Don't discard curl options if timeout is not defined. (@djwatson)
    • Detect failed profile fetches. (@djwatson)
  • Fix stats.arenas.<i>.{dss,lg_dirty_mult,decay_time,pactive,pdirty} for --disable-stats case. (@jasone)

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4.0.4

@jasone jasone released this Oct 24, 2015 · 431 commits to dev since this release

This bugfix release fixes another xallocx() regression. No other regressions have come to light in over a month, so this is likely a good starting point for people who prefer to wait for "dot one" releases with all the major issues shaken out.

Bug fixes:

  • Fix xallocx(..., MALLOCX_ZERO to zero the last full trailing page of large allocations that have been randomly assigned an offset of 0 when --enable-cache-oblivious configure option is enabled.

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4.0.3

@jasone jasone released this Sep 25, 2015 · 436 commits to dev since this release

This bugfix release continues the trend of xallocx() and heap profiling fixes.

Bug fixes:

  • Fix xallocx(..., MALLOCX_ZERO) to zero all trailing bytes of large allocations when --enable-cache-oblivious configure option is enabled.
  • Fix xallocx(..., MALLOCX_ZERO) to zero trailing bytes of huge allocations when resizing from/to a size class that is not a multiple of the chunk size.
  • Fix prof_tctx_dump_iter() to filter out nodes that were created after heap profile dumping started.
  • Work around a potentially bad thread-specific data initialization interaction with NPTL (glibc's pthreads implementation).

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4.0.2

@jasone jasone released this Sep 21, 2015 · 443 commits to dev since this release

This bugfix release addresses a few bugs specific to heap profiling.

Bug fixes:

  • Fix ixallocx_prof_sample() to never modify nor create sampled small allocations. xallocx() is in general incapable of moving small allocations, so this fix removes buggy code without loss of generality.
  • Fix irallocx_prof_sample() to always allocate large regions, even when alignment is non-zero.
  • Fix prof_alloc_rollback() to read tdata from thread-specific data rather than dereferencing a potentially invalid tctx.

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