mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-01 23:04:54 +01:00
Minchan Kim
43ca106fa8
Since CMA is getting used more widely, it's more important to keep monitoring CMA statistics for system health since it's directly related to user experience. This patch introduces sysfs statistics for CMA, in order to provide some basic monitoring of the CMA allocator. * the number of CMA page successful allocations * the number of CMA page allocation failures These two values allow the user to calcuate the allocation failure rate for each CMA area. e.g.) /sys/kernel/mm/cma/WIFI/alloc_pages_[success|fail] /sys/kernel/mm/cma/SENSOR/alloc_pages_[success|fail] /sys/kernel/mm/cma/BLUETOOTH/alloc_pages_[success|fail] The cma_stat was intentionally allocated by dynamic allocation to harmonize with kobject lifetime management. https://lore.kernel.org/linux-mm/[email protected]/ Link: https://lkml.kernel.org/r/[email protected] Link: https://lore.kernel.org/linux-mm/[email protected]/ Signed-off-by: Minchan Kim <[email protected]> Signed-off-by: Colin Ian King <[email protected]> Tested-by: Dmitry Osipenko <[email protected]> Reviewed-by: Dmitry Osipenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: John Hubbard <[email protected]> Tested-by: Anders Roxell <[email protected]> Cc: Suren Baghdasaryan <[email protected]> Cc: John Dias <[email protected]> Cc: Matthew Wilcox (Oracle) <[email protected]> Cc: Colin Ian King <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* CMA SysFS Interface
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*
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* Copyright (c) 2021 Minchan Kim <[email protected]>
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*/
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#include <linux/cma.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include "cma.h"
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#define CMA_ATTR_RO(_name) \
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static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
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void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages)
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{
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atomic64_add(nr_pages, &cma->nr_pages_succeeded);
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}
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void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages)
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{
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atomic64_add(nr_pages, &cma->nr_pages_failed);
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}
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static inline struct cma *cma_from_kobj(struct kobject *kobj)
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{
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return container_of(kobj, struct cma_kobject, kobj)->cma;
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}
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static ssize_t alloc_pages_success_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct cma *cma = cma_from_kobj(kobj);
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return sysfs_emit(buf, "%llu\n",
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atomic64_read(&cma->nr_pages_succeeded));
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}
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CMA_ATTR_RO(alloc_pages_success);
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static ssize_t alloc_pages_fail_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct cma *cma = cma_from_kobj(kobj);
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return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_failed));
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}
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CMA_ATTR_RO(alloc_pages_fail);
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static void cma_kobj_release(struct kobject *kobj)
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{
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struct cma *cma = cma_from_kobj(kobj);
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struct cma_kobject *cma_kobj = cma->cma_kobj;
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kfree(cma_kobj);
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cma->cma_kobj = NULL;
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}
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static struct attribute *cma_attrs[] = {
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&alloc_pages_success_attr.attr,
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&alloc_pages_fail_attr.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(cma);
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static struct kobj_type cma_ktype = {
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.release = cma_kobj_release,
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.sysfs_ops = &kobj_sysfs_ops,
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.default_groups = cma_groups,
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};
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static int __init cma_sysfs_init(void)
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{
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struct kobject *cma_kobj_root;
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struct cma_kobject *cma_kobj;
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struct cma *cma;
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int i, err;
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cma_kobj_root = kobject_create_and_add("cma", mm_kobj);
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if (!cma_kobj_root)
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return -ENOMEM;
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for (i = 0; i < cma_area_count; i++) {
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cma_kobj = kzalloc(sizeof(*cma_kobj), GFP_KERNEL);
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if (!cma_kobj) {
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err = -ENOMEM;
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goto out;
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}
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cma = &cma_areas[i];
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cma->cma_kobj = cma_kobj;
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cma_kobj->cma = cma;
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err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype,
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cma_kobj_root, "%s", cma->name);
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if (err) {
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kobject_put(&cma_kobj->kobj);
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goto out;
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}
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}
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return 0;
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out:
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while (--i >= 0) {
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cma = &cma_areas[i];
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kobject_put(&cma->cma_kobj->kobj);
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}
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kobject_put(cma_kobj_root);
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return err;
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}
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subsys_initcall(cma_sysfs_init);
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