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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-10-31 17:54:14 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-02-06 19:19:23 +0200
commit6c1e875ca6f3a47b40dce715bd07fdfdb8388d55 (patch)
treeb30ab51df8df7c4ed9ef3adb68b234064816497f /drivers/mtd
parent7950d023c562823345892aac2e7c6a49f8de9ad1 (diff)
downloadlinux-6c1e875ca6f3a47b40dce715bd07fdfdb8388d55.tar.bz2
UBI: add slab cache for ubi_scan_leb objects
During scanning UBI allocates one struct ubi_scan_leb object for each PEB, so it can end up allocating thousands of them. Use slab cache to reduce memory consumption for these 48-byte objects, because currently used 'kmalloc()' ends up allocating 64 bytes per object, instead of 48. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/ubi/build.c2
-rw-r--r--drivers/mtd/ubi/scan.c32
-rw-r--r--drivers/mtd/ubi/scan.h2
3 files changed, 25 insertions, 11 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index ef296350aa8f..ec0ad19c691a 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -923,6 +923,8 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
spin_lock_init(&ubi->volumes_lock);
ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
+ dbg_msg("sizeof(struct ubi_scan_leb) %zu", sizeof(struct ubi_scan_leb));
+ dbg_msg("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry));
err = io_init(ubi);
if (err)
diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index 79ca304fc4db..0028bf283930 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -115,7 +115,7 @@ static int add_to_list(struct ubi_scan_info *si, int pnum, int ec, int to_head,
} else
BUG();
- seb = kmalloc(sizeof(struct ubi_scan_leb), GFP_KERNEL);
+ seb = kmem_cache_alloc(si->scan_leb_slab, GFP_KERNEL);
if (!seb)
return -ENOMEM;
@@ -144,7 +144,7 @@ static int add_corrupted(struct ubi_scan_info *si, int pnum, int ec)
dbg_bld("add to corrupted: PEB %d, EC %d", pnum, ec);
- seb = kmalloc(sizeof(struct ubi_scan_leb), GFP_KERNEL);
+ seb = kmem_cache_alloc(si->scan_leb_slab, GFP_KERNEL);
if (!seb)
return -ENOMEM;
@@ -553,7 +553,7 @@ int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
if (err)
return err;
- seb = kmalloc(sizeof(struct ubi_scan_leb), GFP_KERNEL);
+ seb = kmem_cache_alloc(si->scan_leb_slab, GFP_KERNEL);
if (!seb)
return -ENOMEM;
@@ -1152,9 +1152,15 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
si->volumes = RB_ROOT;
err = -ENOMEM;
+ si->scan_leb_slab = kmem_cache_create("ubi_scan_leb_slab",
+ sizeof(struct ubi_scan_leb),
+ 0, 0, NULL);
+ if (!si->scan_leb_slab)
+ goto out_si;
+
ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
if (!ech)
- goto out_si;
+ goto out_slab;
vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
if (!vidh)
@@ -1215,6 +1221,8 @@ out_vidh:
ubi_free_vid_hdr(ubi, vidh);
out_ech:
kfree(ech);
+out_slab:
+ kmem_cache_destroy(si->scan_leb_slab);
out_si:
ubi_scan_destroy_si(si);
return ERR_PTR(err);
@@ -1223,11 +1231,12 @@ out_si:
/**
* destroy_sv - free the scanning volume information
* @sv: scanning volume information
+ * @si: scanning information
*
* This function destroys the volume RB-tree (@sv->root) and the scanning
* volume information.
*/
-static void destroy_sv(struct ubi_scan_volume *sv)
+static void destroy_sv(struct ubi_scan_info *si, struct ubi_scan_volume *sv)
{
struct ubi_scan_leb *seb;
struct rb_node *this = sv->root.rb_node;
@@ -1247,7 +1256,7 @@ static void destroy_sv(struct ubi_scan_volume *sv)
this->rb_right = NULL;
}
- kfree(seb);
+ kmem_cache_free(si->scan_leb_slab, seb);
}
}
kfree(sv);
@@ -1265,19 +1274,19 @@ void ubi_scan_destroy_si(struct ubi_scan_info *si)
list_for_each_entry_safe(seb, seb_tmp, &si->alien, u.list) {
list_del(&seb->u.list);
- kfree(seb);
+ kmem_cache_free(si->scan_leb_slab, seb);
}
list_for_each_entry_safe(seb, seb_tmp, &si->erase, u.list) {
list_del(&seb->u.list);
- kfree(seb);
+ kmem_cache_free(si->scan_leb_slab, seb);
}
list_for_each_entry_safe(seb, seb_tmp, &si->corr, u.list) {
list_del(&seb->u.list);
- kfree(seb);
+ kmem_cache_free(si->scan_leb_slab, seb);
}
list_for_each_entry_safe(seb, seb_tmp, &si->free, u.list) {
list_del(&seb->u.list);
- kfree(seb);
+ kmem_cache_free(si->scan_leb_slab, seb);
}
/* Destroy the volume RB-tree */
@@ -1298,10 +1307,11 @@ void ubi_scan_destroy_si(struct ubi_scan_info *si)
rb->rb_right = NULL;
}
- destroy_sv(sv);
+ destroy_sv(si, sv);
}
}
+ kmem_cache_destroy(si->scan_leb_slab);
kfree(si);
}
diff --git a/drivers/mtd/ubi/scan.h b/drivers/mtd/ubi/scan.h
index a3264f0bef2b..d48aef15ab5d 100644
--- a/drivers/mtd/ubi/scan.h
+++ b/drivers/mtd/ubi/scan.h
@@ -109,6 +109,7 @@ struct ubi_scan_volume {
* @mean_ec: mean erase counter value
* @ec_sum: a temporary variable used when calculating @mean_ec
* @ec_count: a temporary variable used when calculating @mean_ec
+ * @scan_leb_slab: slab cache for &struct ubi_scan_leb objects
*
* This data structure contains the result of scanning and may be used by other
* UBI sub-systems to build final UBI data structures, further error-recovery
@@ -134,6 +135,7 @@ struct ubi_scan_info {
int mean_ec;
uint64_t ec_sum;
int ec_count;
+ struct kmem_cache *scan_leb_slab;
};
struct ubi_device;