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Add opt hpa_hugify_sync to hugify synchronously

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Linux 6.1 introduced `MADV_COLLAPSE` flag to perform a best-effort
synchronous collapse of the native pages mapped by the memory range into
transparent huge pages.

Synchronous hugification might be beneficial for at least two reasons:
we are not relying on khugepaged anymore and get an instant feedback if
range wasn't hugified.

If `hpa_hugify_sync` option is on, we'll try to perform synchronously
collapse and if it wasn't successful, we'll fallback to asynchronous
behaviour.
This commit is contained in:
Dmitry Ilvokhin 2024-10-31 11:43:11 -07:00 • committed by stanjo74
parent a361e886e2
commit 0ce13c6fb5
15 changed files with 141 additions and 8 deletions
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10
configure.ac
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@ -2491,6 +2491,16 @@ if test "x${je_cv_madvise}" = "xyes" ; then
if test "x${je_cv_madv_nocore}" = "xyes" ; then
AC_DEFINE([JEMALLOC_MADVISE_NOCORE], [ ], [ ])
fi
dnl Check for madvise(..., MADV_COLLAPSE).
JE_COMPILABLE([madvise(..., MADV_COLLAPSE)], [
#include <sys/mman.h>
], [
madvise((void *)0, 0, MADV_COLLAPSE);
], [je_cv_madv_collapse])
if test "x${je_cv_madv_collapse}" = "xyes" ; then
AC_DEFINE([JEMALLOC_HAVE_MADVISE_COLLAPSE], [ ], [ ])
fi
else
dnl Check for posix_madvise.
JE_COMPILABLE([posix_madvise], [