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mwindow: free unused windows if we fail to mmap

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The first time may be due to memory fragmentation or just bad luck on a
32-bit system. When we hit the mmap error for the first time, free up
the unused windows and try again.
This commit is contained in:
Carlos Martín Nieto 2016-03-09 11:16:16 +01:00 committed by Edward Thomson
parent 9ee498e800
commit 4ebf745f06
1 changed files with 12 additions and 2 deletions
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14
src/mwindow.c
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@ -296,8 +296,18 @@ static git_mwindow *new_window(
*/ */
if (git_futils_mmap_ro(&w->window_map, fd, w->offset, (size_t)len) < 0) { if (git_futils_mmap_ro(&w->window_map, fd, w->offset, (size_t)len) < 0) {
git__free(w); /*
return NULL; * The first error might be down to memory fragmentation even if
* we're below our soft limits, so free up what we can and try again.
*/
while (git_mwindow_close_lru(mwf) == 0)
/* nop */;
if (git_futils_mmap_ro(&w->window_map, fd, w->offset, (size_t)len) < 0) {
git__free(w);
return NULL;
}
} }
ctl->mmap_calls++; ctl->mmap_calls++;