lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 5 Feb 2007 11:04:34 -0800 (PST) From: Christoph Lameter <clameter@....com> To: Matt Mackall <mpm@...enic.com> cc: Arjan van de Ven <arjan@...radead.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, Nick Piggin <nickpiggin@...oo.com.au>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Rik van Riel <riel@...hat.com> Subject: Re: [RFC] Tracking mlocked pages and moving them off the LRU Patch seems to work and survives AIM7. However, we only know about 30% of the Mlocked pages after boot. With this additional patch to opportunistically move pages off the LRU immediately I can get the counter be accurate (for all practical purposes) like the non lazy version: Index: current/mm/memory.c =================================================================== --- current.orig/mm/memory.c 2007-02-05 10:44:10.000000000 -0800 +++ current/mm/memory.c 2007-02-05 11:01:46.000000000 -0800 @@ -919,6 +919,30 @@ void anon_add(struct vm_area_struct *vma } /* + * Opportunistically move the page off the LRU + * if possible. If we do not succeed then the LRU + * scans will take the page off. + */ +void try_to_set_mlocked(struct page *page) +{ + struct zone *zone; + unsigned long flags; + + if (!PageLRU(page) || PageMlocked(page)) + return; + + zone = page_zone(page); + if (spin_trylock_irqsave(&zone->lru_lock, flags)) { + if (PageLRU(page) && !PageMlocked(page)) { + ClearPageLRU(page); + list_del(&page->lru); + SetPageMlocked(page); + __inc_zone_page_state(page, NR_MLOCK); + } + spin_unlock_irqrestore(&zone->lru_lock, flags); + } +} +/* * Do a quick page-table lookup for a single page. */ struct page *follow_page(struct vm_area_struct *vma, unsigned long address, @@ -978,6 +1002,8 @@ struct page *follow_page(struct vm_area_ set_page_dirty(page); mark_page_accessed(page); } + if (vma->vm_flags & VM_LOCKED) + try_to_set_mlocked(page); unlock: pte_unmap_unlock(ptep, ptl); out: @@ -2271,6 +2297,8 @@ retry: else { inc_mm_counter(mm, file_rss); page_add_file_rmap(new_page); + if (vma->vm_flags & VM_LOCKED) + try_to_set_mlocked(new_page); if (write_access) { dirty_page = new_page; get_page(dirty_page); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists