Hi Christoph, On 31/07/13 17:45, Christoph Lameter wrote: > Crap you cannot do PAGE_SIZE allocations with kmalloc_large. Fails when > freeing pages. Need to only do the multiple page allocs with > kmalloc_large. > > Subject: seq_file: Use kmalloc_large for page sized allocation > > There is no point in using the slab allocation functions for > large page order allocation. Use kmalloc_large(). > > This fixes the warning about large allocs but it will still cause > large contiguous allocs that could fail because of memory fragmentation. Thanks for the point, do you plan to make kmalloc_large available for extern access in a separate mainline patch? Since kmalloc_large is statically defined in slub_def.h and when including it to seq_file.c we have a lot of conflicting types: .. In file included from ../linux/fs/seq_file.c:8:0: ../linux/include/linux/slub_def.h: In function 'kmalloc': ../linux/include/linux/slub_def.h:161:14: error: 'KMALLOC_MAX_CACHE_SIZE' undeclared (first use in this function) ../results/linux/include/linux/slub_def.h:161:14: note: each undeclared identifier is reported only once for each function it appears in ../linux/include/linux/slub_def.h:165:4: error: implicit declaration of function 'kmalloc_index' [-Werror=implicit-function-declaration] ../linux/include/linux/slub_def.h:168:12: error: 'ZERO_SIZE_PTR' undeclared (first use in this function) ../linux/include/linux/slub_def.h:170:34: error: 'kmalloc_caches' undeclared (first use in this function) .. Thanks & BR Wladislav Wiebe > > Signed-off-by: Christoph Lameter <cl@xxxxxxxxx> > > Index: linux/fs/seq_file.c > =================================================================== > --- linux.orig/fs/seq_file.c 2013-07-31 10:39:03.050472030 -0500 > +++ linux/fs/seq_file.c 2013-07-31 10:39:03.050472030 -0500 > @@ -136,7 +136,7 @@ static int traverse(struct seq_file *m, > Eoverflow: > m->op->stop(m, p); > kfree(m->buf); > - m->buf = kmalloc(m->size <<= 1, GFP_KERNEL); > + m->buf = kmalloc_large(m->size <<= 1, GFP_KERNEL); > return !m->buf ? -ENOMEM : -EAGAIN; > } > > @@ -232,7 +232,7 @@ ssize_t seq_read(struct file *file, char > goto Fill; > m->op->stop(m, p); > kfree(m->buf); > - m->buf = kmalloc(m->size <<= 1, GFP_KERNEL); > + m->buf = kmalloc_large(m->size <<= 1, GFP_KERNEL); > if (!m->buf) > goto Enomem; > m->count = 0; > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>