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Use mmap MAP_NOSYNC option to limit shared memory writes

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mmap() is rarely used for shared memory, but when it is, this option is
useful, particularly on the BSDs.

Patch by Sean Chittenden
This commit is contained in:
Bruce Momjian
2015-03-21 22:06:19 -04:00
parent 9d61b9953c
commit 34afbba84e
2 changed files with 10 additions and 2 deletions
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4
src/backend/storage/ipc/dsm_impl.c
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@ -368,7 +368,7 @@ dsm_impl_posix(dsm_op op, dsm_handle handle, Size request_size,
/* Map it. */
address = mmap(NULL, request_size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_HASSEMAPHORE, fd, 0);
MAP_SHARED | MAP_HASSEMAPHORE | MAP_NOSYNC, fd, 0);
if (address == MAP_FAILED)
{
int save_errno;
@ -960,7 +960,7 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
/* Map it. */
address = mmap(NULL, request_size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_HASSEMAPHORE, fd, 0);
MAP_SHARED | MAP_HASSEMAPHORE | MAP_NOSYNC, fd, 0);
if (address == MAP_FAILED)
{
int save_errno;