Re: [PATCH 05/10] mm, page_alloc: Distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
From: Vlastimil Babka
Date: Wed Sep 30 2015 - 08:26:45 EST
[+CC lustre maintainers]
On 09/29/2015 03:35 PM, Mel Gorman wrote:
Ok, I'll add a TODO to create a patch that removes GFP_IOFS entirely. It
can be tacked on to the end of the series.
Okay, that makes sense to me. Thanks!
This?
Thanks for adding this, I think I also pointed this GFP_IOFS oddness in
earlier versions.
---8<---
mm: page_alloc: Remove GFP_IOFS
GFP_IOFS was intended to be shorthand for clearing two flags, not a
set of allocation flags. There is only one user of this flag combination
now and there appears to be no reason why Lustre had to be protected
Looks like a mistake to me. __GFP_IO | __GFP_FS have no effect without
(former) __GFP_WAIT, so I doubt __GFP_WAIT was omitted on purpose, while
leaving the other two. The naming of GFP_IOFS suggested it was to be
used in allocations, leading to the mistake.
But I see you also converted several instances of GFP_NOFS to
GFP_KERNEL. Is that correct? This is a filesystem driver after all...
from reclaim stalls. As none of the sites appear to be atomic, this
patch simply deletes GFP_IOFS and converts Lustre to using GFP_KERNEL.
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/lustre/lnet/lnet/router.c | 2 +-
drivers/staging/lustre/lnet/selftest/conrpc.c | 2 +-
drivers/staging/lustre/lnet/selftest/rpc.c | 2 +-
drivers/staging/lustre/lustre/libcfs/module.c | 2 +-
drivers/staging/lustre/lustre/libcfs/tracefile.c | 2 +-
drivers/staging/lustre/lustre/llite/remote_perm.c | 2 +-
drivers/staging/lustre/lustre/mgc/mgc_request.c | 10 +++++-----
drivers/staging/lustre/lustre/obdecho/echo_client.c | 2 +-
drivers/staging/lustre/lustre/osc/osc_cache.c | 2 +-
include/linux/gfp.h | 1 -
10 files changed, 13 insertions(+), 14 deletions(-)
diff --git a/drivers/staging/lustre/lnet/lnet/router.c b/drivers/staging/lustre/lnet/lnet/router.c
index 4fbae5ef44a9..dad9816dfee7 100644
--- a/drivers/staging/lustre/lnet/lnet/router.c
+++ b/drivers/staging/lustre/lnet/lnet/router.c
@@ -1246,7 +1246,7 @@ lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
for (i = 0; i < npages; i++) {
page = alloc_pages_node(
cfs_cpt_spread_node(lnet_cpt_table(), cpt),
- __GFP_ZERO | GFP_IOFS, 0);
+ GFP_KERNEL | __GFP_ZERO, 0);
if (page == NULL) {
while (--i >= 0)
__free_page(rb->rb_kiov[i].kiov_page);
diff --git a/drivers/staging/lustre/lnet/selftest/conrpc.c b/drivers/staging/lustre/lnet/selftest/conrpc.c
index a1a4e08f7391..3fc37de8d304 100644
--- a/drivers/staging/lustre/lnet/selftest/conrpc.c
+++ b/drivers/staging/lustre/lnet/selftest/conrpc.c
@@ -861,7 +861,7 @@ lstcon_testrpc_prep(lstcon_node_t *nd, int transop, unsigned feats,
bulk->bk_iovs[i].kiov_offset = 0;
bulk->bk_iovs[i].kiov_len = len;
bulk->bk_iovs[i].kiov_page =
- alloc_page(GFP_IOFS);
+ alloc_page(GFP_KERNEL);
if (bulk->bk_iovs[i].kiov_page == NULL) {
lstcon_rpc_put(*crpc);
diff --git a/drivers/staging/lustre/lnet/selftest/rpc.c b/drivers/staging/lustre/lnet/selftest/rpc.c
index 6ae133138b17..aa0f88fbb221 100644
--- a/drivers/staging/lustre/lnet/selftest/rpc.c
+++ b/drivers/staging/lustre/lnet/selftest/rpc.c
@@ -146,7 +146,7 @@ srpc_alloc_bulk(int cpt, unsigned bulk_npg, unsigned bulk_len, int sink)
int nob;
pg = alloc_pages_node(cfs_cpt_spread_node(lnet_cpt_table(), cpt),
- GFP_IOFS, 0);
+ GFP_KERNEL, 0);
if (pg == NULL) {
CERROR("Can't allocate page %d of %d\n", i, bulk_npg);
srpc_free_bulk(bk);
diff --git a/drivers/staging/lustre/lustre/libcfs/module.c b/drivers/staging/lustre/lustre/libcfs/module.c
index 806f9747a3a2..303143f28c06 100644
--- a/drivers/staging/lustre/lustre/libcfs/module.c
+++ b/drivers/staging/lustre/lustre/libcfs/module.c
@@ -321,7 +321,7 @@ static int libcfs_ioctl(struct cfs_psdev_file *pfile, unsigned long cmd, void *a
struct libcfs_ioctl_data *data;
int err = 0;
- LIBCFS_ALLOC_GFP(buf, 1024, GFP_IOFS);
+ LIBCFS_ALLOC_GFP(buf, 1024, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
diff --git a/drivers/staging/lustre/lustre/libcfs/tracefile.c b/drivers/staging/lustre/lustre/libcfs/tracefile.c
index effa2af58c13..a7d72f69c4eb 100644
--- a/drivers/staging/lustre/lustre/libcfs/tracefile.c
+++ b/drivers/staging/lustre/lustre/libcfs/tracefile.c
@@ -810,7 +810,7 @@ int cfs_trace_allocate_string_buffer(char **str, int nob)
if (nob > 2 * PAGE_CACHE_SIZE) /* string must be "sensible" */
return -EINVAL;
- *str = kmalloc(nob, GFP_IOFS | __GFP_ZERO);
+ *str = kmalloc(nob, GFP_KERNEL | __GFP_ZERO);
This could use kzalloc.
if (*str == NULL)
return -ENOMEM;
diff --git a/drivers/staging/lustre/lustre/llite/remote_perm.c b/drivers/staging/lustre/lustre/llite/remote_perm.c
index 39022ea88b5f..b27f016c3dd4 100644
--- a/drivers/staging/lustre/lustre/llite/remote_perm.c
+++ b/drivers/staging/lustre/lustre/llite/remote_perm.c
@@ -84,7 +84,7 @@ static struct hlist_head *alloc_rmtperm_hash(void)
OBD_SLAB_ALLOC_GFP(hash, ll_rmtperm_hash_cachep,
REMOTE_PERM_HASHSIZE * sizeof(*hash),
- GFP_IOFS);
+ GFP_KERNEL);
if (!hash)
return NULL;
diff --git a/drivers/staging/lustre/lustre/mgc/mgc_request.c b/drivers/staging/lustre/lustre/mgc/mgc_request.c
index 019ee2f256aa..79551319d754 100644
--- a/drivers/staging/lustre/lustre/mgc/mgc_request.c
+++ b/drivers/staging/lustre/lustre/mgc/mgc_request.c
@@ -198,7 +198,7 @@ struct config_llog_data *do_config_log_add(struct obd_device *obd,
CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
cfg ? cfg->cfg_instance : NULL);
- cld = kzalloc(sizeof(*cld) + strlen(logname) + 1, GFP_NOFS);
+ cld = kzalloc(sizeof(*cld) + strlen(logname) + 1, GFP_KERNEL);
if (!cld)
return ERR_PTR(-ENOMEM);
@@ -1127,7 +1127,7 @@ static int mgc_apply_recover_logs(struct obd_device *mgc,
LASSERT(cfg->cfg_instance != NULL);
LASSERT(cfg->cfg_sb == cfg->cfg_instance);
- inst = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS);
+ inst = kzalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
if (!inst)
return -ENOMEM;
@@ -1334,14 +1334,14 @@ static int mgc_process_recover_log(struct obd_device *obd,
if (cfg->cfg_last_idx == 0) /* the first time */
nrpages = CONFIG_READ_NRPAGES_INIT;
- pages = kcalloc(nrpages, sizeof(*pages), GFP_NOFS);
+ pages = kcalloc(nrpages, sizeof(*pages), GFP_KERNEL);
if (pages == NULL) {
rc = -ENOMEM;
goto out;
}
for (i = 0; i < nrpages; i++) {
- pages[i] = alloc_page(GFP_IOFS);
+ pages[i] = alloc_page(GFP_KERNEL);
if (pages[i] == NULL) {
rc = -ENOMEM;
goto out;
@@ -1492,7 +1492,7 @@ static int mgc_process_cfg_log(struct obd_device *mgc,
if (cld->cld_cfg.cfg_sb)
lsi = s2lsi(cld->cld_cfg.cfg_sb);
- env = kzalloc(sizeof(*env), GFP_NOFS);
+ env = kzalloc(sizeof(*env), GFP_KERNEL);
if (!env)
return -ENOMEM;
diff --git a/drivers/staging/lustre/lustre/obdecho/echo_client.c b/drivers/staging/lustre/lustre/obdecho/echo_client.c
index 27bd170c3a28..7c8443644300 100644
--- a/drivers/staging/lustre/lustre/obdecho/echo_client.c
+++ b/drivers/staging/lustre/lustre/obdecho/echo_client.c
@@ -1561,7 +1561,7 @@ static int echo_client_kbrw(struct echo_device *ed, int rw, struct obdo *oa,
(oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
(oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
- gfp_mask = ((ostid_id(&oa->o_oi) & 2) == 0) ? GFP_IOFS : GFP_HIGHUSER;
+ gfp_mask = ((ostid_id(&oa->o_oi) & 2) == 0) ? GFP_KERNEL : GFP_HIGHUSER;
LASSERT(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ);
LASSERT(lsm != NULL);
diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c
index c72035e048aa..6fa6bc6874ab 100644
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -346,7 +346,7 @@ static struct osc_extent *osc_extent_alloc(struct osc_object *obj)
{
struct osc_extent *ext;
- OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, GFP_IOFS);
+ OBD_SLAB_ALLOC_PTR_GFP(ext, osc_extent_kmem, GFP_KERNEL);
if (ext == NULL)
return NULL;
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 60b2db94d49d..369227202ac2 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -134,7 +134,6 @@ struct vm_area_struct;
#define GFP_USER (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
#define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM)
#define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE)
-#define GFP_IOFS (__GFP_IO | __GFP_FS | __GFP_KSWAPD_RECLAIM)
#define GFP_TRANSHUGE ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & \
~__GFP_KSWAPD_RECLAIM)
--
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