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authorNeeraj Singh <neerajsi@microsoft.com>2022-03-10 22:43:20 (GMT)
committerJunio C Hamano <gitster@pobox.com>2022-03-10 23:10:22 (GMT)
commitabf38abec201cded6094801766d69e11a6c112b6 (patch)
treef1258b40f52f600be015a365ae5e57ed3b977a33 /contrib/buildsystems/CMakeLists.txt
parent19d3f228c8df7e946278c96fb52acf1cea0f6a7a (diff)
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core.fsyncmethod: add writeout-only mode
This commit introduces the `core.fsyncMethod` configuration knob, which can currently be set to `fsync` or `writeout-only`. The new writeout-only mode attempts to tell the operating system to flush its in-memory page cache to the storage hardware without issuing a CACHE_FLUSH command to the storage controller. Writeout-only fsync is significantly faster than a vanilla fsync on common hardware, since data is written to a disk-side cache rather than all the way to a durable medium. Later changes in this patch series will take advantage of this primitive to implement batching of hardware flushes. When git_fsync is called with FSYNC_WRITEOUT_ONLY, it may fail and the caller is expected to do an ordinary fsync as needed. On Apple platforms, the fsync system call does not issue a CACHE_FLUSH directive to the storage controller. This change updates fsync to do fcntl(F_FULLFSYNC) to make fsync actually durable. We maintain parity with existing behavior on Apple platforms by setting the default value of the new core.fsyncMethod option. Signed-off-by: Neeraj Singh <neerajsi@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'contrib/buildsystems/CMakeLists.txt')
-rw-r--r--contrib/buildsystems/CMakeLists.txt16
1 files changed, 12 insertions, 4 deletions
diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
index e44232f..3a9e624 100644
--- a/contrib/buildsystems/CMakeLists.txt
+++ b/contrib/buildsystems/CMakeLists.txt
@@ -261,10 +261,18 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
NOGDI OBJECT_CREATION_MODE=1 __USE_MINGW_ANSI_STDIO=0
USE_NED_ALLOCATOR OVERRIDE_STRDUP MMAP_PREVENTS_DELETE USE_WIN32_MMAP
UNICODE _UNICODE HAVE_WPGMPTR ENSURE_MSYSTEM_IS_SET HAVE_RTLGENRANDOM)
- list(APPEND compat_SOURCES compat/mingw.c compat/winansi.c compat/win32/path-utils.c
- compat/win32/pthread.c compat/win32mmap.c compat/win32/syslog.c
- compat/win32/trace2_win32_process_info.c compat/win32/dirent.c
- compat/nedmalloc/nedmalloc.c compat/strdup.c)
+ list(APPEND compat_SOURCES
+ compat/mingw.c
+ compat/winansi.c
+ compat/win32/flush.c
+ compat/win32/path-utils.c
+ compat/win32/pthread.c
+ compat/win32mmap.c
+ compat/win32/syslog.c
+ compat/win32/trace2_win32_process_info.c
+ compat/win32/dirent.c
+ compat/nedmalloc/nedmalloc.c
+ compat/strdup.c)
set(NO_UNIX_SOCKETS 1)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")