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u3: specify madv_random for file-backed snapshot mapping #423

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u3: specify madv_random for file-backed snapshot mapping #423

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5 changes: 5 additions & 0 deletions pkg/noun/events.c
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Original file line number Diff line number Diff line change
Expand Up @@ -995,6 +995,11 @@ _ce_loom_mapf_north(c3_i fid_i, c3_w pgs_w, c3_w old_w)
pgs_w, strerror(errno));
u3_assert(0);
}

if ( -1 == madvise(_ce_ptr(0), _ce_len(pgs_w), MADV_RANDOM) ) {
fprintf(stderr, "loom: madv_random failed (%u pages): %s\r\n",
pgs_w, strerror(errno));
}
}

if ( old_w > pgs_w ) {
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