diff options
author | Arun KS <arunks@codeaurora.org> | 2018-12-28 00:34:29 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 12:11:47 -0800 |
commit | ca79b0c211af63fa3276f0e3fd7dd9ada2439839 (patch) | |
tree | a9198e85582744619903c85349583bb453fe36cb /arch | |
parent | 9705bea5f833f4fc21d5bef5fce7348427f76ea4 (diff) |
mm: convert totalram_pages and totalhigh_pages variables to atomic
totalram_pages and totalhigh_pages are made static inline function.
Main motivation was that managed_page_count_lock handling was complicating
things. It was discussed in length here,
https://lore.kernel.org/patchwork/patch/995739/#1181785 So it seemes
better to remove the lock and convert variables to atomic, with preventing
poteintial store-to-read tearing as a bonus.
[akpm@linux-foundation.org: coding style fixes]
Link: http://lkml.kernel.org/r/1542090790-21750-4-git-send-email-arunks@codeaurora.org
Signed-off-by: Arun KS <arunks@codeaurora.org>
Suggested-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/csky/mm/init.c | 4 | ||||
-rw-r--r-- | arch/powerpc/platforms/pseries/cmm.c | 10 | ||||
-rw-r--r-- | arch/s390/mm/init.c | 2 | ||||
-rw-r--r-- | arch/um/kernel/mem.c | 2 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/microcode/core.c | 2 |
5 files changed, 10 insertions, 10 deletions
diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c index dc07c078f9b8..66e597053488 100644 --- a/arch/csky/mm/init.c +++ b/arch/csky/mm/init.c @@ -71,7 +71,7 @@ void free_initrd_mem(unsigned long start, unsigned long end) ClearPageReserved(virt_to_page(start)); init_page_count(virt_to_page(start)); free_page(start); - totalram_pages++; + totalram_pages_inc(); } } #endif @@ -88,7 +88,7 @@ void free_initmem(void) ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); free_page(addr); - totalram_pages++; + totalram_pages_inc(); addr += PAGE_SIZE; } diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c index 25427a48feae..e8d63a6a9002 100644 --- a/arch/powerpc/platforms/pseries/cmm.c +++ b/arch/powerpc/platforms/pseries/cmm.c @@ -208,7 +208,7 @@ static long cmm_alloc_pages(long nr) pa->page[pa->index++] = addr; loaned_pages++; - totalram_pages--; + totalram_pages_dec(); spin_unlock(&cmm_lock); nr--; } @@ -247,7 +247,7 @@ static long cmm_free_pages(long nr) free_page(addr); loaned_pages--; nr--; - totalram_pages++; + totalram_pages_inc(); } spin_unlock(&cmm_lock); cmm_dbg("End request with %ld pages unfulfilled\n", nr); @@ -291,7 +291,7 @@ static void cmm_get_mpp(void) int rc; struct hvcall_mpp_data mpp_data; signed long active_pages_target, page_loan_request, target; - signed long total_pages = totalram_pages + loaned_pages; + signed long total_pages = totalram_pages() + loaned_pages; signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE; rc = h_get_mpp(&mpp_data); @@ -322,7 +322,7 @@ static void cmm_get_mpp(void) cmm_dbg("delta = %ld, loaned = %lu, target = %lu, oom = %lu, totalram = %lu\n", page_loan_request, loaned_pages, loaned_pages_target, - oom_freed_pages, totalram_pages); + oom_freed_pages, totalram_pages()); } static struct notifier_block cmm_oom_nb = { @@ -581,7 +581,7 @@ static int cmm_mem_going_offline(void *arg) free_page(pa_curr->page[idx]); freed++; loaned_pages--; - totalram_pages++; + totalram_pages_inc(); pa_curr->page[idx] = pa_last->page[--pa_last->index]; if (pa_last->index == 0) { if (pa_curr == pa_last) diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 76d0708438e9..50388190b393 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -59,7 +59,7 @@ static void __init setup_zero_pages(void) order = 7; /* Limit number of empty zero pages for small memory sizes */ - while (order > 2 && (totalram_pages >> 10) < (1UL << order)) + while (order > 2 && (totalram_pages() >> 10) < (1UL << order)) order--; empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 2da209687a22..8d21a83dd289 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -51,7 +51,7 @@ void __init mem_init(void) /* this will put all low memory onto the freelists */ memblock_free_all(); - max_low_pfn = totalram_pages; + max_low_pfn = totalram_pages(); max_pfn = max_low_pfn; mem_init_print_info(NULL); kmalloc_ok = 1; diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index 168fa272cc3e..97f9ada9ceda 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -434,7 +434,7 @@ static ssize_t microcode_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos) { ssize_t ret = -EINVAL; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); if ((len >> PAGE_SHIFT) > nr_pages) { pr_err("too much data (max %ld pages)\n", nr_pages); |