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pnfs/flexfiles: Add tracepoints for detecting pnfs fallback to MDS

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Add tracepoints to allow debugging of the event chain leading to
a pnfs fallback to doing I/O through the MDS.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust
2019-07-18 09:32:17 -04:00
parent 58bbeab425
commit d5b9216fd5
5 changed files with 112 additions and 1 deletions
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26
fs/nfs/flexfilelayout/flexfilelayout.c
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@@ -934,6 +934,10 @@ out_nolseg:
if (pgio->pg_error < 0)
return;
out_mds:
trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
0, NFS4_MAX_UINT64, IOMODE_READ,
NFS_I(pgio->pg_inode)->layout,
pgio->pg_lseg);
pnfs_put_lseg(pgio->pg_lseg);
pgio->pg_lseg = NULL;
nfs_pageio_reset_read_mds(pgio);
@@ -1000,6 +1004,10 @@ retry:
return;
out_mds:
trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
0, NFS4_MAX_UINT64, IOMODE_RW,
NFS_I(pgio->pg_inode)->layout,
pgio->pg_lseg);
pnfs_put_lseg(pgio->pg_lseg);
pgio->pg_lseg = NULL;
nfs_pageio_reset_write_mds(pgio);
@@ -1026,6 +1034,10 @@ ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
if (pgio->pg_lseg)
return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
0, NFS4_MAX_UINT64, IOMODE_RW,
NFS_I(pgio->pg_inode)->layout,
pgio->pg_lseg);
/* no lseg means that pnfs is not in use, so no mirroring here */
nfs_pageio_reset_write_mds(pgio);
out:
@@ -1075,6 +1087,10 @@ static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
hdr->args.count,
(unsigned long long)hdr->args.offset);
trace_pnfs_mds_fallback_write_done(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_RW, NFS_I(hdr->inode)->layout,
hdr->lseg);
task->tk_status = pnfs_write_done_resend_to_mds(hdr);
}
}
@@ -1094,6 +1110,10 @@ static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
hdr->args.count,
(unsigned long long)hdr->args.offset);
trace_pnfs_mds_fallback_read_done(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_READ, NFS_I(hdr->inode)->layout,
hdr->lseg);
task->tk_status = pnfs_read_done_resend_to_mds(hdr);
}
}
@@ -1827,6 +1847,9 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
out_failed:
if (ff_layout_avoid_mds_available_ds(lseg))
return PNFS_TRY_AGAIN;
trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
return PNFS_NOT_ATTEMPTED;
}
@@ -1892,6 +1915,9 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
out_failed:
if (ff_layout_avoid_mds_available_ds(lseg))
return PNFS_TRY_AGAIN;
trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
return PNFS_NOT_ATTEMPTED;
}