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mdbx: skip msync(MS_ASYNC) on Linux > 2.6.19.

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Change-Id: Ic1f631ef856a09cf62353c2b0092b0341ecf4fa2
This commit is contained in:
Leonid Yuriev 2019-08-19 21:31:05 +03:00
parent dcd4574510
commit 261f697d8c
1 changed files with 7 additions and 0 deletions
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7
src/osal.c
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@ -784,6 +784,13 @@ int mdbx_msync(mdbx_mmap_t *map, size_t offset, size_t length, int async) {
return MDBX_SUCCESS;
return GetLastError();
#else
#ifdef __linux__
if (async && linux_kernel_version > 0x02061300)
/* Since Linux 2.6.19, MS_ASYNC is in fact a no-op,
since the kernel properly tracks dirty pages and flushes them to storage
as necessary. */
return MDBX_SUCCESS;
#endif /* Linux */
const int mode = async ? MS_ASYNC : MS_SYNC;
return (msync(ptr, length, mode) == 0) ? MDBX_SUCCESS : errno;
#endif