[PATCH 5/5] xfs_io: add linux madvise advice codes

Darrick J. Wong
2024-03-26T03:22:09Z

From: Darrick J. Wong <djwong@kernel.org>

Add all the Linux-specific madvise codes. We're going to need
MADV_POPULATE_READ for a regression test.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
io/madvise.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 76 insertions(+), 1 deletion(-)

diff --git a/io/madvise.c b/io/madvise.c
index 6e9c5b121d72..ede233955ced 100644
--- a/io/madvise.c
+++ b/io/madvise.c
@@ -9,6 +9,7 @@
#include <sys/mman.h>
#include "init.h"
#include "io.h"
+#include <asm/mman.h>

static cmdinfo_t madvise_cmd;

@@ -26,6 +27,31 @@ madvise_help(void)
" -r -- expect random page references (POSIX_MADV_RANDOM)\n"
" -s -- expect sequential page references (POSIX_MADV_SEQUENTIAL)\n"
" -w -- will need these pages (POSIX_MADV_WILLNEED) [*]\n"
+"\n"
+"The following Linux-specific advise values are available:\n"
+#ifdef MADV_COLLAPSE
+" -c -- try to collapse range into transparent hugepages (MADV_COLLAPSE)\n"
+#endif
+#ifdef MADV_COLD
+" -D -- deactivate the range (MADV_COLD)\n"
+#endif
+" -f -- free the range (MADV_FREE)\n"
+" -h -- disable transparent hugepages (MADV_NOHUGEPAGE)\n"
+" -H -- enable transparent hugepages (MADV_HUGEPAGE)\n"
+" -m -- mark the range mergeable (MADV_MERGEABLE)\n"
+" -M -- mark the range unmergeable (MADV_UNMERGEABLE)\n"
+" -o -- mark the range offline (MADV_SOFT_OFFLINE)\n"
+" -p -- punch a hole in the file (MADV_REMOVE)\n"
+" -P -- poison the page cache (MADV_HWPOISON)\n"
+#ifdef MADV_POPULATE_READ
+" -R -- prefault in the range for read (MADV_POPULATE_READ)\n"
+#endif
+#ifdef MADV_POPULATE_WRITE
+" -W -- prefault in the range for write (MADV_POPULATE_WRITE)\n"
+#endif
+#ifdef MADV_PAGEOUT
+" -X -- reclaim the range (MADV_PAGEOUT)\n"
+#endif
" Notes:\n"
" NORMAL sets the default readahead setting on the file.\n"
" RANDOM sets the readahead setting on the file to zero.\n"
@@ -45,20 +71,69 @@ madvise_f(
int advise = MADV_NORMAL, c;
size_t blocksize, sectsize;

- while ((c = getopt(argc, argv, "drsw")) != EOF) {
+ while ((c = getopt(argc, argv, "cdDfhHmMopPrRswWX")) != EOF) {
switch (c) {
+#ifdef MADV_COLLAPSE
+ case 'c': /* collapse to thp */
+ advise = MADV_COLLAPSE;
+ break;
+#endif
case 'd': /* Don't need these pages */
advise = MADV_DONTNEED;
break;
+#ifdef MADV_COLD
+ case 'D': /* make more likely to be reclaimed */
+ advise = MADV_COLD;
+ break;
+#endif
+ case 'f': /* page range out of memory */
+ advise = MADV_FREE;
+ break;
+ case 'h': /* enable thp memory */
+ advise = MADV_HUGEPAGE;
+ break;
+ case 'H': /* disable thp memory */
+ advise = MADV_NOHUGEPAGE;
+ break;
+ case 'm': /* enable merging */
+ advise = MADV_MERGEABLE;
+ break;
+ case 'M': /* disable merging */
+ advise = MADV_UNMERGEABLE;
+ break;
+ case 'o': /* offline */
+ advise = MADV_SOFT_OFFLINE;
+ break;
+ case 'p': /* punch hole */
+ advise = MADV_REMOVE;
+ break;
+ case 'P': /* poison */
+ advise = MADV_HWPOISON;
+ break;
case 'r': /* Expect random page references */
advise = MADV_RANDOM;
break;
+#ifdef MADV_POPULATE_READ
+ case 'R': /* fault in pages for read */
+ advise = MADV_POPULATE_READ;
+ break;
+#endif
case 's': /* Expect sequential page references */
advise = MADV_SEQUENTIAL;
break;
case 'w': /* Will need these pages */
advise = MADV_WILLNEED;
break;
+#ifdef MADV_POPULATE_WRITE
+ case 'W': /* fault in pages for write */
+ advise = MADV_POPULATE_WRITE;
+ break;
+#endif
+#ifdef MADV_PAGEOUT
+ case 'X': /* reclaim memory */
+ advise = MADV_PAGEOUT;
+ break;
+#endif
default:
exitcode = 1;
return command_usage(&madvise_cmd);