git/Makefile, branch v2.1.2

Merge branch 'jk/fix-profile-feedback-build'

2014-08-26T18:16:25Z

Fix profile-feedback build broken in 2.1 for tarball releases. * jk/fix-profile-feedback-build: Makefile: make perf tests optional for profile build

Makefile: make perf tests optional for profile build

2014-08-19T16:59:22Z

The perf tests need a repository to operate on; if none is defined, we fall back to the repository containing our build directory. That fails, though, for an exported tarball of git.git, which has no repository. Since 5d7fd6d we run the perf tests as part of "make profile". Therefore "make profile" fails out of the box on released tarballs of v2.1.0. We can fix this by making the perf tests optional; if they are skipped, we still run the regular test suite, which should give a lot of profile data (and is what we used to do prior to 5d7fd6d anyway). Signed-off-by: Jeff King Acked-by: Andi Kleen Signed-off-by: Junio C Hamano

Merge branch 'kb/perf-trace'

2014-07-22T17:59:19Z

* kb/perf-trace: api-trace.txt: add trace API documentation progress: simplify performance measurement by using getnanotime() wt-status: simplify performance measurement by using getnanotime() git: add performance tracing for git's main() function to debug scripts trace: add trace_performance facility to debug performance issues trace: add high resolution timer function to debug performance issues trace: add 'file:line' to all trace output trace: move code around, in preparation to file:line output trace: add current timestamp to all trace output trace: disable additional trace output for unit tests trace: add infrastructure to augment trace output with additional info sha1_file: change GIT_TRACE_PACK_ACCESS logging to use trace API Documentation/git.txt: improve documentation of 'GIT_TRACE*' variables trace: improve trace performance trace: remove redundant printf format attribute trace: consistently name the format parameter trace: move trace declarations from cache.h to new trace.h

Merge branch 'ak/profile-feedback-build'

2014-07-21T18:17:47Z

* ak/profile-feedback-build: Fix profile feedback with -jN and add profile-fast Run the perf test suite for profile feedback too Don't define away __attribute__ on gcc Use BASIC_FLAGS for profile feedback

Merge branch 'nd/split-index'

2014-07-16T18:25:40Z

An experiment to use two files (the base file and incremental changes relative to it) to represent the index to reduce I/O cost of rewriting a large index when only small part of the working tree changes. * nd/split-index: (32 commits) t1700: new tests for split-index mode t2104: make sure split index mode is off for the version test read-cache: force split index mode with GIT_TEST_SPLIT_INDEX read-tree: note about dropping split-index mode or index version read-tree: force split-index mode off on --index-output rev-parse: add --shared-index-path to get shared index path update-index --split-index: do not split if $GIT_DIR is read only update-index: new options to enable/disable split index mode split-index: strip pathname of on-disk replaced entries split-index: do not invalidate cache-tree at read time split-index: the reading part split-index: the writing part read-cache: mark updated entries for split index read-cache: save deleted entries in split index read-cache: mark new entries for split index read-cache: split-index mode read-cache: save index SHA-1 after reading entry.c: update cache_changed if refresh_cache is set in checkout_entry() cache-tree: mark istate->cache_changed on prime_cache_tree() cache-tree: mark istate->cache_changed on cache tree update ...

trace: add high resolution timer function to debug performance issues

2014-07-14T04:25:20Z

Add a getnanotime() function that returns nanoseconds since 01/01/1970 as unsigned 64-bit integer (i.e. overflows in july 2554). This is easier to work with than e.g. struct timeval or struct timespec. Basing the timer on the epoch allows using the results with other time-related APIs. To simplify adaption to different platforms, split the implementation into a common getnanotime() and a platform-specific highres_nanos() function. The common getnanotime() function handles errors, falling back to gettimeofday() if highres_nanos() isn't implemented or doesn't work. getnanotime() is also responsible for normalizing to the epoch. The offset to the system clock is calculated only once on initialization, i.e. manually setting the system clock has no impact on the timer (except if the fallback gettimeofday() is in use). Git processes are typically short lived, so we don't need to handle clock drift. The highres_nanos() function returns monotonically increasing nanoseconds relative to some arbitrary point in time (e.g. system boot), or 0 on failure. Providing platform-specific implementations should be relatively easy, e.g. adapting to clock_gettime() as defined by the POSIX realtime extensions is seven lines of code. This version includes highres_nanos() implementations for: * Linux: using clock_gettime(CLOCK_MONOTONIC) * Windows: using QueryPerformanceCounter() Todo: * enable clock_gettime() on more platforms * add Mac OSX version, e.g. using mach_absolute_time + mach_timebase_info Signed-off-by: Karsten Blees Signed-off-by: Junio C Hamano

Fix profile feedback with -jN and add profile-fast

2014-07-08T17:56:47Z

Profile feedback always failed for me with -jN. The problem was that there was no implicit ordering between the profile generate stage and the profile use stage. So some objects in the later stage would be linked with profile generate objects, and fail due to the missing -lgcov. This adds a new profile target that implicitely enforces the correct ordering by using submakes. Plus a profile-install target to also install. This is also nicer to type that PROFILE=... Plus I always run the performance test suite now for the full profile run. In addition I also added a profile-fast / profile-fast-install target the only runs the performance test suite instead of the whole test suite. This significantly speeds up the profile build, which was totally dominated by test suite run time. However it may have less coverage of course. Signed-off-by: Andi Kleen Signed-off-by: Junio C Hamano

Run the perf test suite for profile feedback too

2014-07-08T17:56:37Z

Signed-off-by: Andi Kleen Signed-off-by: Junio C Hamano

Use BASIC_FLAGS for profile feedback

2014-07-07T21:01:11Z

Use BASIC_CFLAGS instead of CFLAGS to set up the profile feedback option in the Makefile. This allows still overriding CFLAGS on the make command line without disabling profile feedback. Signed-off-by: Andi Kleen Signed-off-by: Junio C Hamano

verify-commit: scriptable commit signature verification

2014-06-23T22:50:31Z

Commit signatures can be verified using "git show -s --show-signature" or the "%G?" pretty format and parsing the output, which is well suited for user inspection, but not for scripting. Provide a command "verify-commit" which is analogous to "verify-tag": It returns 0 for good signatures and non-zero otherwise, has the gpg output on stderr and (optionally) the commit object on stdout, sans the signature, just like "verify-tag" does. Signed-off-by: Michael J Gruber Signed-off-by: Junio C Hamano