From: Badari Pulavarty <pbadari@us.ibm.com>
To: Jeff Dike <jdike@addtoit.com>
Cc: Hugh Dickins <hugh@veritas.com>, linux-mm <linux-mm@kvack.org>,
dvhltc@us.ibm.com
Subject: Re: [RFC][PATCH] OVERCOMMIT_ALWAYS extension
Date: Thu, 20 Oct 2005 15:37:24 -0700 [thread overview]
Message-ID: <1129847844.16301.37.camel@localhost.localdomain> (raw)
In-Reply-To: <20051020172757.GB6590@localhost.localdomain>
[-- Attachment #1: Type: text/plain, Size: 1117 bytes --]
On Thu, 2005-10-20 at 13:27 -0400, Jeff Dike wrote:
> On Thu, Oct 20, 2005 at 08:11:05AM -0700, Badari Pulavarty wrote:
> > Initial plan was to use invalidate_inode_pages2_range(). But it didn't
> > really do what we wanted. So we ended up using truncate_inode_pages().
> > If it really works, then I plan to add truncate_inode_pages2_range()
> > to which works on a range of pages, instead of the whole file.
> > madvise(DONTNEED) followed by madvise(DISCARD) should be able to drop
> > all the pages in the given range.
> >
> > Does this make sense ? Does this seem like right approach ?
>
> Works for me. I obviously have no idea about the wider vm implications of
> this - that would be Hugh's territory :-)
Here is the latest version of madvise(DISCARD) I cooked up after
talking to Darren.
Changes from previous:
1) madvise(DISCARD) - zaps the range and discards the pages. So, no
need to call madvise(DONTNEED) before.
2) I added truncate_inode_pages2_range() to just discard only the
range of pages - not the whole file.
Hugh, when you get a chance could you review this instead ?
Thanks,
Badari
[-- Attachment #2: madvise-discard2.patch --]
[-- Type: text/x-patch, Size: 16242 bytes --]
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-alpha/mman.h linux-2.6.14-rc3.db2/include/asm-alpha/mman.h
--- linux-2.6.14-rc3/include/asm-alpha/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-alpha/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -42,6 +42,7 @@
#define MADV_WILLNEED 3 /* will need these pages */
#define MADV_SPACEAVAIL 5 /* ensure resources are available */
#define MADV_DONTNEED 6 /* don't need these pages */
+#define MADV_DISCARD 7 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-arm/mman.h linux-2.6.14-rc3.db2/include/asm-arm/mman.h
--- linux-2.6.14-rc3/include/asm-arm/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-arm/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -35,6 +35,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-arm26/mman.h linux-2.6.14-rc3.db2/include/asm-arm26/mman.h
--- linux-2.6.14-rc3/include/asm-arm26/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-arm26/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -35,6 +35,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-cris/mman.h linux-2.6.14-rc3.db2/include/asm-cris/mman.h
--- linux-2.6.14-rc3/include/asm-cris/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-cris/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -37,6 +37,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-frv/mman.h linux-2.6.14-rc3.db2/include/asm-frv/mman.h
--- linux-2.6.14-rc3/include/asm-frv/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-frv/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -35,6 +35,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-h8300/mman.h linux-2.6.14-rc3.db2/include/asm-h8300/mman.h
--- linux-2.6.14-rc3/include/asm-h8300/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-h8300/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -35,6 +35,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-i386/mman.h linux-2.6.14-rc3.db2/include/asm-i386/mman.h
--- linux-2.6.14-rc3/include/asm-i386/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-i386/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -35,6 +35,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-ia64/mman.h linux-2.6.14-rc3.db2/include/asm-ia64/mman.h
--- linux-2.6.14-rc3/include/asm-ia64/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-ia64/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -43,6 +43,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-m32r/mman.h linux-2.6.14-rc3.db2/include/asm-m32r/mman.h
--- linux-2.6.14-rc3/include/asm-m32r/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-m32r/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -37,6 +37,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-m68k/mman.h linux-2.6.14-rc3.db2/include/asm-m68k/mman.h
--- linux-2.6.14-rc3/include/asm-m68k/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-m68k/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -35,6 +35,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-mips/mman.h linux-2.6.14-rc3.db2/include/asm-mips/mman.h
--- linux-2.6.14-rc3/include/asm-mips/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-mips/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -65,6 +65,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-parisc/mman.h linux-2.6.14-rc3.db2/include/asm-parisc/mman.h
--- linux-2.6.14-rc3/include/asm-parisc/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-parisc/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -38,6 +38,7 @@
#define MADV_SPACEAVAIL 5 /* insure that resources are reserved */
#define MADV_VPS_PURGE 6 /* Purge pages from VM page cache */
#define MADV_VPS_INHERIT 7 /* Inherit parents page size */
+#define MADV_DISCARD 8 /* discard pages right now */
/* The range 12-64 is reserved for page size specification. */
#define MADV_4K_PAGES 12 /* Use 4K pages */
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-powerpc/mman.h linux-2.6.14-rc3.db2/include/asm-powerpc/mman.h
--- linux-2.6.14-rc3/include/asm-powerpc/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-powerpc/mman.h 2005-10-20 13:55:18.000000000 -0700
@@ -44,6 +44,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-s390/mman.h linux-2.6.14-rc3.db2/include/asm-s390/mman.h
--- linux-2.6.14-rc3/include/asm-s390/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-s390/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -43,6 +43,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-sh/mman.h linux-2.6.14-rc3.db2/include/asm-sh/mman.h
--- linux-2.6.14-rc3/include/asm-sh/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-sh/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -35,6 +35,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-sparc/mman.h linux-2.6.14-rc3.db2/include/asm-sparc/mman.h
--- linux-2.6.14-rc3/include/asm-sparc/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-sparc/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -54,6 +54,7 @@
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
#define MADV_FREE 0x5 /* (Solaris) contents can be freed */
+#define MADV_DISCARD 0x6 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-sparc64/mman.h linux-2.6.14-rc3.db2/include/asm-sparc64/mman.h
--- linux-2.6.14-rc3/include/asm-sparc64/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-sparc64/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -54,6 +54,7 @@
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
#define MADV_FREE 0x5 /* (Solaris) contents can be freed */
+#define MADV_DISCARD 0x6 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-v850/mman.h linux-2.6.14-rc3.db2/include/asm-v850/mman.h
--- linux-2.6.14-rc3/include/asm-v850/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-v850/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -32,6 +32,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-x86_64/mman.h linux-2.6.14-rc3.db2/include/asm-x86_64/mman.h
--- linux-2.6.14-rc3/include/asm-x86_64/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-x86_64/mman.h 2005-10-20 10:52:37.000000000 -0700
@@ -36,6 +36,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/asm-xtensa/mman.h linux-2.6.14-rc3.db2/include/asm-xtensa/mman.h
--- linux-2.6.14-rc3/include/asm-xtensa/mman.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/asm-xtensa/mman.h 2005-10-20 13:56:45.000000000 -0700
@@ -72,6 +72,7 @@
#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
+#define MADV_DISCARD 0x5 /* discard pages right now */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS
diff -Naurp -X dontdiff linux-2.6.14-rc3/include/linux/mm.h linux-2.6.14-rc3.db2/include/linux/mm.h
--- linux-2.6.14-rc3/include/linux/mm.h 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/include/linux/mm.h 2005-10-20 13:41:57.000000000 -0700
@@ -865,6 +865,7 @@ extern unsigned long do_brk(unsigned lon
/* filemap.c */
extern unsigned long page_unuse(struct page *);
extern void truncate_inode_pages(struct address_space *, loff_t);
+extern void truncate_inode_pages2_range(struct address_space *, loff_t, loff_t);
/* generic vm_area_ops exported for stackable file systems */
extern struct page *filemap_nopage(struct vm_area_struct *, unsigned long, int *);
diff -Naurp -X dontdiff linux-2.6.14-rc3/mm/madvise.c linux-2.6.14-rc3.db2/mm/madvise.c
--- linux-2.6.14-rc3/mm/madvise.c 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/mm/madvise.c 2005-10-20 13:37:41.000000000 -0700
@@ -137,6 +137,40 @@ static long madvise_dontneed(struct vm_a
return 0;
}
+static long madvise_discard(struct vm_area_struct * vma,
+ struct vm_area_struct ** prev,
+ unsigned long start, unsigned long end)
+{
+ struct address_space *mapping;
+ loff_t offset, endoff;
+ int error = 0;
+
+ if (!vma->vm_file || !vma->vm_file->f_mapping
+ || !vma->vm_file->f_mapping->host) {
+ return -EINVAL;
+ }
+
+ mapping = vma->vm_file->f_mapping;
+ if (mapping == &swapper_space) {
+ return -EINVAL;
+ }
+
+ error = madvise_dontneed(vma, prev, start, end);
+ if (error)
+ return error;
+
+ /* looks good, try and rip it out of page cache */
+ printk("%s: trying to rip shm vma (%p) inode from page cache\n", __FUNCTION__, vma);
+ offset = (loff_t)(start - vma->vm_start);
+ endoff = (loff_t)(end - vma->vm_start);
+ printk("call truncate_inode_pages(%p, %x %x)\n", mapping,
+ (unsigned int)offset, (unsigned int)endoff);
+ down(&mapping->host->i_sem);
+ truncate_inode_pages2_range(mapping, offset, endoff);
+ up(&mapping->host->i_sem);
+ return 0;
+}
+
static long
madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
unsigned long start, unsigned long end, int behavior)
@@ -153,6 +187,9 @@ madvise_vma(struct vm_area_struct *vma,
case MADV_RANDOM:
error = madvise_behavior(vma, prev, start, end, behavior);
break;
+ case MADV_DISCARD:
+ error = madvise_discard(vma, prev, start, end);
+ break;
case MADV_WILLNEED:
error = madvise_willneed(vma, prev, start, end);
diff -Naurp -X dontdiff linux-2.6.14-rc3/mm/truncate.c linux-2.6.14-rc3.db2/mm/truncate.c
--- linux-2.6.14-rc3/mm/truncate.c 2005-09-30 14:17:35.000000000 -0700
+++ linux-2.6.14-rc3.db2/mm/truncate.c 2005-10-20 13:59:20.000000000 -0700
@@ -113,7 +113,8 @@ invalidate_complete_page(struct address_
*
* Called under (and serialised by) inode->i_sem.
*/
-void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
+void truncate_inode_pages2_range(struct address_space *mapping, loff_t lstart,
+ loff_t end)
{
const pgoff_t start = (lstart + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
const unsigned partial = lstart & (PAGE_CACHE_SIZE - 1);
@@ -126,7 +127,8 @@ void truncate_inode_pages(struct address
pagevec_init(&pvec, 0);
next = start;
- while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
+ while (next <= end &&
+ pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
pgoff_t page_index = page->index;
@@ -142,6 +144,8 @@ void truncate_inode_pages(struct address
}
truncate_complete_page(mapping, page);
unlock_page(page);
+ if (next > end)
+ break;
}
pagevec_release(&pvec);
cond_resched();
@@ -176,12 +180,20 @@ void truncate_inode_pages(struct address
next++;
truncate_complete_page(mapping, page);
unlock_page(page);
+ if (next > end)
+ break;
}
pagevec_release(&pvec);
}
}
+void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
+{
+ return truncate_inode_pages2_range(mapping, lstart, ~0UL);
+}
+
EXPORT_SYMBOL(truncate_inode_pages);
+EXPORT_SYMBOL(truncate_inode_pages2_range);
/**
* invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
next prev parent reply other threads:[~2005-10-20 22:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-17 17:30 [RFC] " Badari Pulavarty
2005-10-17 18:13 ` Hugh Dickins
2005-10-17 18:25 ` Hugh Dickins
2005-10-17 23:14 ` Badari Pulavarty
2005-10-18 16:05 ` [RFC][PATCH] " Badari Pulavarty
2005-10-19 17:56 ` Hugh Dickins
2005-10-19 18:32 ` Jeff Dike
2005-10-19 21:21 ` Badari Pulavarty
2005-10-19 22:38 ` Jeff Dike
2005-10-19 18:50 ` Badari Pulavarty
2005-10-19 19:12 ` Darren Hart
2005-10-19 20:10 ` Hugh Dickins
2005-10-19 20:47 ` Jeff Dike
2005-10-20 15:11 ` Badari Pulavarty
2005-10-20 17:27 ` Jeff Dike
2005-10-20 22:37 ` Badari Pulavarty [this message]
2005-10-24 20:04 ` Hugh Dickins
2005-10-24 20:22 ` Darren Hart
2005-10-24 20:24 ` Badari Pulavarty
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