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commit 10deb2492c8b0dd4dceb963850c91e053bb8d6df
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Author: Andrew Price <anprice@redhat.com>
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Date: Thu Apr 13 06:51:15 2017 -0400
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mkfs.gfs2: Free unnecessary cached pages, disable readahead
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With a 300T file system, cached pages built up quite heavily and could
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be left over from previous io on the device. Use POSIX_FADV_DONTNEED
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where appropriate.
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Also, readahead isn't required as mkfs.gfs2 mainly writing full block
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ranges at unpredictable locations so use POSIX_FADV_RANDOM to minimise
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the overhead from that.
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Resolves: rhbz#1440269
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Signed-off-by: Andrew Price <anprice@redhat.com>
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diff --git a/gfs2/mkfs/main_mkfs.c b/gfs2/mkfs/main_mkfs.c
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index 0801a4b..83065fb 100644
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--- a/gfs2/mkfs/main_mkfs.c
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+++ b/gfs2/mkfs/main_mkfs.c
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@@ -817,6 +817,7 @@ static int place_rgrps(struct gfs2_sbd *sdp, lgfs2_rgrps_t rgs, struct mkfs_opts
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gfs2_progress_update(&progress, (sdp->rgrps));
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}
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gfs2_progress_close(&progress, _("Done\n"));
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+ posix_fadvise(sdp->device_fd, 0, sdp->fssize * sdp->bsize, POSIX_FADV_DONTNEED);
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return 0;
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}
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@@ -909,6 +910,11 @@ static void open_dev(struct mkfs_dev *dev, int withprobe)
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exit(1);
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}
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+ /* Freshen up the cache */
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+ posix_fadvise(dev->fd, 0, 0, POSIX_FADV_DONTNEED);
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+ /* Turn off readahead, we're just writing new blocks */
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+ posix_fadvise(dev->fd, 0, 0, POSIX_FADV_RANDOM);
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+
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error = fstat(dev->fd, &dev->stat);
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if (error < 0) {
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perror(dev->path);
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@@ -1075,7 +1081,7 @@ int main(int argc, char *argv[])
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perror(opts.dev.path);
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exit(EXIT_FAILURE);
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}
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-
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+ posix_fadvise(opts.dev.fd, 0, 0, POSIX_FADV_DONTNEED);
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error = close(opts.dev.fd);
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if (error){
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perror(opts.dev.path);
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